Jackson 2.11, update named modules, add pmd/checkstyle/spotbugs

build.gradle

@@ -2,6 +2,9 @@ plugins {
     id "de.marcphilipp.nexus-publish" version "0.4.0"
     id "io.codearte.nexus-staging" version "0.21.1"
     id "org.xbib.gradle.plugin.asciidoctor" version "1.5.6.0.1"
+    id "com.github.spotbugs" version "4.2.4"
+    id "pmd"
+    id "checkstyle"
 }
 
 wrapper {
@@ -29,6 +32,9 @@ subprojects {
     apply from: rootProject.file('gradle/ide/idea.gradle')
     apply from: rootProject.file('gradle/compile/java.gradle')
     apply from: rootProject.file('gradle/test/junit5.gradle')
+    apply from: rootProject.file('gradle/quality/checkstyle.gradle')
+    apply from: rootProject.file('gradle/quality/pmd.gradle')
+    apply from: rootProject.file('gradle/quality/spotbugs.gradle')
     apply from: rootProject.file('gradle/publishing/publication.gradle')
 }
 apply from: rootProject.file('gradle/publishing/sonatype.gradle')

config/checkstyle/checkstyle.xml

@@ -38,6 +38,22 @@ page at http://checkstyle.sourceforge.net/config.html -->
           Only allows a package-info.java, not package.html. -->
     </module>
 
+    <module name="LineLength">
+        <!-- Checks if a line is too long. -->
+        <property name="max" value="${com.puppycrawl.tools.checkstyle.checks.sizes.LineLength.max}" default="128"/>
+        <property name="severity" value="error"/>
+
+        <!--
+          The default ignore pattern exempts the following elements:
+            - import statements
+            - long URLs inside comments
+        -->
+
+        <property name="ignorePattern"
+                  value="${com.puppycrawl.tools.checkstyle.checks.sizes.LineLength.ignorePattern}"
+                  default="^(package .*;\s*)|(import .*;\s*)|( *(\*|//).*https?://.*)$"/>
+    </module>
+
     <!-- All Java AST specific tests live under TreeWalker module. -->
     <module name="TreeWalker">
 
@@ -75,9 +91,6 @@ page at http://checkstyle.sourceforge.net/config.html -->
             <property name="severity" value="warning"/>
             <property name="allowMissingParamTags" value="true"/>
             <property name="allowMissingReturnTag" value="true"/>
-            <property name="allowMissingThrowsTags" value="true"/>
-            <property name="allowThrowsTagsForSubclasses" value="true"/>
-            <property name="allowUndeclaredRTE" value="true"/>
         </module>
 
         <module name="JavadocType">
@@ -183,21 +196,6 @@ page at http://checkstyle.sourceforge.net/config.html -->
 
         -->
 
-        <module name="LineLength">
-            <!-- Checks if a line is too long. -->
-            <property name="max" value="${com.puppycrawl.tools.checkstyle.checks.sizes.LineLength.max}" default="128"/>
-            <property name="severity" value="error"/>
-
-            <!--
-              The default ignore pattern exempts the following elements:
-                - import statements
-                - long URLs inside comments
-            -->
-
-            <property name="ignorePattern"
-                      value="${com.puppycrawl.tools.checkstyle.checks.sizes.LineLength.ignorePattern}"
-                      default="^(package .*;\s*)|(import .*;\s*)|( *(\*|//).*https?://.*)$"/>
-        </module>
 
         <module name="LeftCurly">
             <!-- Checks for placement of the left curly brace ('{'). -->

content-core/src/main/java/module-info.java

@@ -5,7 +5,7 @@ module org.xbib.content.core {
     exports org.xbib.content.settings;
     exports org.xbib.content.util.geo;
     exports org.xbib.content.util.unit;
-    requires com.fasterxml.jackson.core;
+    requires transitive com.fasterxml.jackson.core;
     provides org.xbib.content.XContent with
             org.xbib.content.json.JsonXContent;
     provides org.xbib.content.settings.SettingsLoader with

content-core/src/main/java/org/xbib/content/json/JsonXContent.java

@@ -2,7 +2,6 @@ package org.xbib.content.json;
 
 import com.fasterxml.jackson.core.JsonEncoding;
 import com.fasterxml.jackson.core.JsonFactory;
-import com.fasterxml.jackson.core.JsonGenerator;
 import com.fasterxml.jackson.core.JsonParser;
 import org.xbib.content.XContent;
 import org.xbib.content.XContentBuilder;
@@ -29,7 +28,6 @@ public class JsonXContent implements XContent {
     static {
         jsonFactory = new JsonFactory();
         jsonFactory.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
-        jsonFactory.configure(JsonGenerator.Feature.QUOTE_FIELD_NAMES, true);
         jsonXContent = new JsonXContent();
     }
 
@@ -97,7 +95,7 @@ public class JsonXContent implements XContent {
 
     @Override
     public boolean isXContent(BytesReference bytes) {
-        int length = bytes.length() < 20 ? bytes.length() : 20;
+        int length = Math.min(bytes.length(), 20);
         if (length == 0) {
             return false;
         }

content-json/build.gradle

@@ -1,8 +1,5 @@
 dependencies {
     api "com.fasterxml.jackson.core:jackson-databind:${project.property('jackson.version')}"
-    testImplementation("junit:junit:${project.property('junit4.version')}") {
-        exclude group: 'org.hamcrest'
-    }
     testImplementation("org.mockito:mockito-core:${project.property('mockito.version')}") {
         exclude group: 'org.hamcrest'
     }

content-json/src/main/java/module-info.java

@@ -4,5 +4,6 @@ module org.xbib.content.json {
     exports org.xbib.content.json.mergepatch;
     exports org.xbib.content.json.patch;
     exports org.xbib.content.json.pointer;
-    requires com.fasterxml.jackson.databind;
+    requires transitive com.fasterxml.jackson.core;
+    requires transitive com.fasterxml.jackson.databind;
 }

content-json/src/test/java/org/xbib/content/json/jackson/JsonNodeReaderTest.java

@@ -1,29 +1,29 @@
 package org.xbib.content.json.jackson;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
-
 import com.fasterxml.jackson.core.JsonParseException;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import org.junit.Assert;
+import org.junit.jupiter.api.Assertions;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
-
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.Reader;
 import java.io.StringReader;
+import java.nio.charset.StandardCharsets;
 
 /**
  *
  */
-public final class JsonNodeReaderTest extends Assert {
+public final class JsonNodeReaderTest {
 
     @Test
     public void streamIsClosedOnRead()
             throws IOException {
-        final InputStream in = spy(new ByteArrayInputStream("[]".getBytes("UTF-8")));
+        final InputStream in = spy(new ByteArrayInputStream("[]".getBytes(StandardCharsets.UTF_8)));
         final JsonNode node = new JsonNodeReader().fromInputStream(in);
         verify(in).close();
         assertEquals(node, new ObjectMapper().readTree(new ByteArrayInputStream("[]".getBytes("UTF-8"))));
@@ -39,21 +39,14 @@ public final class JsonNodeReaderTest extends Assert {
     }
 
     @Test
-    public void malformedDataThrowsExpectedException()
+    public void malformedDataThrowsExpectedException() {
-            throws IOException {
-
         String[] inputs = new String[]{
                 "", "[]{}", "[]]"
         };
         final JsonNodeReader reader = new JsonNodeReader();
         for (String input : inputs) {
-            try {
+            Assertions.assertThrows(JsonParseException.class, () ->
-                reader.fromInputStream(new ByteArrayInputStream(input.getBytes()));
+                reader.fromInputStream(new ByteArrayInputStream(input.getBytes())));
-                fail("No exception thrown!!");
-            } catch (JsonParseException e) {
-                //
         }
     }
 }
-
-}

content-json/src/test/java/org/xbib/content/json/jackson/JsonNumEqualsTest.java

@@ -1,12 +1,11 @@
 package org.xbib.content.json.jackson;
 
+import static org.junit.jupiter.api.Assertions.assertTrue;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.fasterxml.jackson.databind.node.JsonNodeFactory;
 import com.fasterxml.jackson.databind.node.ObjectNode;
-import org.junit.Assert;
+import org.junit.jupiter.api.Test;
-import org.junit.Test;
-
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Iterator;
@@ -15,7 +14,7 @@ import java.util.List;
 /**
  *
  */
-public final class JsonNumEqualsTest extends Assert {
+public final class JsonNumEqualsTest {
 
     private static final JsonNodeFactory FACTORY = JsonNodeFactory.instance;
 

content-json/src/test/java/org/xbib/content/json/pointer/JsonNodeResolverTest.java

@@ -1,29 +1,29 @@
 package org.xbib.content.json.pointer;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.fasterxml.jackson.databind.node.JsonNodeFactory;
 import com.fasterxml.jackson.databind.node.ObjectNode;
-import org.junit.Assert;
+import org.junit.jupiter.api.Test;
-import org.junit.Test;
 import org.xbib.content.json.jackson.JacksonUtils;
 import org.xbib.content.json.jackson.NodeType;
 import org.xbib.content.json.jackson.SampleNodeProvider;
-
 import java.util.ArrayList;
 import java.util.List;
 
 /**
  *
  */
-public final class JsonNodeResolverTest extends Assert {
+public final class JsonNodeResolverTest {
+
     private static final JsonNodeFactory FACTORY = JacksonUtils.nodeFactory();
 
     @Test
     public void resolvingNullReturnsNull() {
         final JsonNodeResolver resolver
                 = new JsonNodeResolver(ReferenceToken.fromRaw("whatever"));
-
         assertNull(resolver.get(null));
     }
 
@@ -33,7 +33,6 @@ public final class JsonNodeResolverTest extends Assert {
                 NodeType.OBJECT).next()[0];
         final JsonNodeResolver resolver
                 = new JsonNodeResolver(ReferenceToken.fromRaw("whatever"));
-
         assertNull(resolver.get(node));
     }
 
@@ -42,18 +41,13 @@ public final class JsonNodeResolverTest extends Assert {
         final JsonNodeResolver resolver
                 = new JsonNodeResolver(ReferenceToken.fromRaw("a"));
         final JsonNode target = FACTORY.textNode("b");
-
         ObjectNode node;
-
         node = FACTORY.objectNode();
         node.set("a", target);
-
         final JsonNode resolved = resolver.get(node);
         assertEquals(resolved, target);
-
         node = FACTORY.objectNode();
         node.set("b", target);
-
         assertNull(resolver.get(node));
     }
 
@@ -61,13 +55,10 @@ public final class JsonNodeResolverTest extends Assert {
     public void resolvingArrayIndicesWorks() {
         final JsonNodeResolver resolver
                 = new JsonNodeResolver(ReferenceToken.fromInt(1));
-
         final JsonNode target = FACTORY.textNode("b");
         final ArrayNode node = FACTORY.arrayNode();
-
         node.add(target);
         assertNull(resolver.get(node));
-
         node.add(target);
         assertEquals(target, resolver.get(node));
     }
@@ -77,7 +68,6 @@ public final class JsonNodeResolverTest extends Assert {
         final JsonNode target = FACTORY.textNode("b");
         final ArrayNode node = FACTORY.arrayNode();
         node.add(target);
-
         List<Object[]> list = new ArrayList<>();
         list.add(new Object[]{"-1"});
         list.add(new Object[]{"232398087298731987987232"});

content-json/src/test/java/org/xbib/content/json/pointer/JsonPointerTest.java

@@ -1,13 +1,13 @@
 package org.xbib.content.json.pointer;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import com.fasterxml.jackson.databind.JsonNode;
-import org.junit.Assert;
+import org.junit.jupiter.api.Assertions;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.xbib.content.json.jackson.JacksonUtils;
 import org.xbib.content.json.jackson.JsonLoader;
 import org.xbib.content.json.jackson.NodeType;
 import org.xbib.content.json.jackson.SampleNodeProvider;
-
 import java.io.IOException;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -20,7 +20,7 @@ import java.util.Map;
 /**
  *
  */
-public final class JsonPointerTest extends Assert {
+public final class JsonPointerTest {
 
     private static final String PACKAGE = JsonPointerTest.class.getPackage().getName().replace('.', '/');
     private final JsonNode testData;
@@ -33,11 +33,12 @@ public final class JsonPointerTest extends Assert {
         document = testData.get("document");
     }
 
-    @Test(expected = NullPointerException.class)
+    @Test
     public void cannotAppendNullPointer() {
+        Assertions.assertThrows(NullPointerException.class, () -> {
                     final JsonPointer foo = null;
                     JsonPointer.empty().append(foo);
-        fail("No exception thrown!!");
+                });
     }
 
     @Test

content-json/src/test/java/org/xbib/content/json/pointer/ReferenceTokenTest.java

@@ -1,55 +1,39 @@
 package org.xbib.content.json.pointer;
 
-import org.junit.Assert;
+import static org.junit.jupiter.api.Assertions.assertEquals;
-import org.junit.Test;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
-
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
 import java.util.Arrays;
 import java.util.List;
 
 /**
  *
  */
-public final class ReferenceTokenTest extends Assert {
+public final class ReferenceTokenTest {
 
     @Test
-    public void nullCookedRaisesError()
+    public void nullCookedRaisesError() {
-            throws JsonPointerException {
+        Assertions.assertThrows(NullPointerException.class, () ->
-        try {
+            ReferenceToken.fromCooked(null));
-            ReferenceToken.fromCooked(null);
-            fail("No exception thrown!!");
-        } catch (NullPointerException e) {
-            //assertEquals(e.getMessage(), BUNDLE.getMessage("nullInput"));
-        }
     }
 
     @Test
     public void nullRawRaisesError() {
-        try {
+        Assertions.assertThrows(NullPointerException.class, () ->
-            ReferenceToken.fromRaw(null);
+            ReferenceToken.fromRaw(null));
-            fail("No exception thrown!!");
-        } catch (NullPointerException e) {
-            //assertEquals(e.getMessage(), BUNDLE.getMessage("nullInput"));
-        }
     }
 
     @Test
     public void emptyEscapeRaisesTheAppropriateException() {
-        try {
+        Assertions.assertThrows(JsonPointerException.class, () ->
-            ReferenceToken.fromCooked("whatever~");
+            ReferenceToken.fromCooked("whatever~"));
-            fail("No exception thrown!!");
-        } catch (JsonPointerException e) {
-            //assertEquals(e.getMessage(), BUNDLE.getMessage("emptyEscape"));
-        }
     }
 
     @Test
     public void illegalEscapeRaisesTheAppropriateException() {
-        try {
+        Assertions.assertThrows(JsonPointerException.class, () ->
-            ReferenceToken.fromCooked("~a");
+            ReferenceToken.fromCooked("~a"));
-            fail("No exception thrown!!");
-        } catch (JsonPointerException e) {
-            //assertEquals(e.getMessage(), BUNDLE.getMessage("illegalEscape"));
-        }
     }
 
     @Test
@@ -68,8 +52,7 @@ public final class ReferenceTokenTest extends Assert {
             String raw = (String) o[1];
             final ReferenceToken token1 = ReferenceToken.fromCooked(cooked);
             final ReferenceToken token2 = ReferenceToken.fromRaw(raw);
-
+            assertEquals(token1, token2);
-            assertTrue(token1.equals(token2));
             assertEquals(token2.toString(), cooked);
         }
     }
@@ -88,9 +71,9 @@ public final class ReferenceTokenTest extends Assert {
             final ReferenceToken fromInt = ReferenceToken.fromInt(index);
             final ReferenceToken cooked = ReferenceToken.fromCooked(asString);
             final ReferenceToken raw = ReferenceToken.fromRaw(asString);
-            assertTrue(fromInt.equals(cooked));
+            assertEquals(fromInt, cooked);
-            assertTrue(cooked.equals(raw));
+            assertEquals(cooked, raw);
-            assertTrue(raw.equals(fromInt));
+            assertEquals(raw, fromInt);
             assertEquals(fromInt.toString(), asString);
         }
     }
@@ -100,7 +83,6 @@ public final class ReferenceTokenTest extends Assert {
             throws JsonPointerException {
         final ReferenceToken zero = ReferenceToken.fromCooked("0");
         final ReferenceToken zerozero = ReferenceToken.fromCooked("00");
-
+        assertNotEquals(zero, zerozero);
-        assertFalse(zero.equals(zerozero));
     }
 }

content-json/src/test/java/org/xbib/content/json/pointer/TreePointerTest.java

@@ -1,16 +1,19 @@
 package org.xbib.content.json.pointer;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.only;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
-
 import com.fasterxml.jackson.core.TreeNode;
-import org.junit.Assert;
+import org.junit.jupiter.api.Assertions;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
-
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -19,24 +22,24 @@ import java.util.List;
 /**
  *
  */
-public final class TreePointerTest extends Assert {
+public final class TreePointerTest {
-    @Test(expected = NullPointerException.class)
+
-    public void attemptToBuildTokensFromNullRaisesAnError() throws JsonPointerException {
+    @Test
-        TreePointer.tokensFromInput(null);
+    public void attemptToBuildTokensFromNullRaisesAnError() {
-        fail("No exception thrown!!");
+        Assertions.assertThrows(NullPointerException.class, () ->
+                TreePointer.tokensFromInput(null));
     }
 
-    @Test(expected = JsonPointerException.class)
+    @Test
-    public void buildingTokenListYellsIfIllegalPointer() throws JsonPointerException {
+    public void buildingTokenListYellsIfIllegalPointer() {
-        TreePointer.tokensFromInput("a/b");
+        Assertions.assertThrows(JsonPointerException.class, () ->
-        fail("No exception thrown!!");
+            TreePointer.tokensFromInput("a/b"));
     }
 
     @Test
     public void buildingTokenListIsUnfazedByAnEmptyInput()
             throws JsonPointerException {
-        assertEquals(TreePointer.tokensFromInput(""),
+        assertEquals(TreePointer.tokensFromInput(""), new ArrayList<>());
-                new ArrayList<>());
     }
 
     @Test

content-rdf/src/main/java/module-info.java

@@ -10,8 +10,7 @@ module org.xbib.content.rdf {
     exports org.xbib.content.rdf.io.turtle;
     exports org.xbib.content.rdf.io.xml;
     exports org.xbib.content.rdf.util;
-    requires org.xbib.content.core;
+    requires transitive org.xbib.content.core;
-    requires org.xbib.content.resource;
+    requires transitive org.xbib.content.resource;
-    requires org.xbib.content.xml;
+    requires transitive org.xbib.content.xml;
-    requires java.xml;
 }

content-smile/config/checkstyle/checkstyle.xml

@@ -1,323 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE module PUBLIC
-        "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
-        "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
-
-<!-- This is a checkstyle configuration file. For descriptions of
-what the following rules do, please see the checkstyle configuration
-page at http://checkstyle.sourceforge.net/config.html -->
-
-<module name="Checker">
-
-    <module name="FileTabCharacter">
-        <!-- Checks that there are no tab characters in the file.
-        -->
-    </module>
-
-    <module name="NewlineAtEndOfFile">
-        <property name="lineSeparator" value="lf"/>
-    </module>
-
-    <module name="RegexpSingleline">
-        <!-- Checks that FIXME is not used in comments.  TODO is preferred.
-        -->
-        <property name="format" value="((//.*)|(\*.*))FIXME" />
-        <property name="message" value='TODO is preferred to FIXME.  e.g. "TODO(johndoe): Refactor when v2 is released."' />
-    </module>
-
-    <module name="RegexpSingleline">
-        <!-- Checks that TODOs are named.  (Actually, just that they are followed
-             by an open paren.)
-        -->
-        <property name="format" value="((//.*)|(\*.*))TODO[^(]" />
-        <property name="message" value='All TODOs should be named.  e.g. "TODO(johndoe): Refactor when v2 is released."' />
-    </module>
-
-    <module name="JavadocPackage">
-        <!-- Checks that each Java package has a Javadoc file used for commenting.
-          Only allows a package-info.java, not package.html. -->
-    </module>
-
-    <!-- All Java AST specific tests live under TreeWalker module. -->
-    <module name="TreeWalker">
-
-        <!--
-
-        IMPORT CHECKS
-
-        -->
-
-        <module name="RedundantImport">
-            <!-- Checks for redundant import statements. -->
-            <property name="severity" value="error"/>
-        </module>
-
-        <module name="ImportOrder">
-            <!-- Checks for out of order import statements. -->
-
-            <property name="severity" value="warning"/>
-            <property name="groups" value="com,junit,net,org,java,javax"/>
-            <!-- This ensures that static imports go first. -->
-            <property name="option" value="top"/>
-            <property name="tokens" value="STATIC_IMPORT, IMPORT"/>
-        </module>
-
-        <!--
-
-        JAVADOC CHECKS
-
-        -->
-
-        <!-- Checks for Javadoc comments.                     -->
-        <!-- See http://checkstyle.sf.net/config_javadoc.html -->
-        <module name="JavadocMethod">
-            <property name="scope" value="protected"/>
-            <property name="severity" value="warning"/>
-            <property name="allowMissingJavadoc" value="true"/>
-            <property name="allowMissingParamTags" value="true"/>
-            <property name="allowMissingReturnTag" value="true"/>
-            <property name="allowMissingThrowsTags" value="true"/>
-            <property name="allowThrowsTagsForSubclasses" value="true"/>
-            <property name="allowUndeclaredRTE" value="true"/>
-        </module>
-
-        <module name="JavadocType">
-            <property name="scope" value="protected"/>
-            <property name="severity" value="error"/>
-        </module>
-
-        <module name="JavadocStyle">
-            <property name="severity" value="warning"/>
-        </module>
-
-        <!--
-
-        NAMING CHECKS
-
-        -->
-
-        <!-- Item 38 - Adhere to generally accepted naming conventions -->
-
-        <module name="PackageName">
-            <!-- Validates identifiers for package names against the
-              supplied expression. -->
-            <!-- Here the default checkstyle rule restricts package name parts to
-              seven characters, this is not in line with common practice at Google.
-            -->
-            <property name="format" value="^[a-z]+(\.[a-z][a-z0-9]{1,})*$"/>
-            <property name="severity" value="warning"/>
-        </module>
-
-        <module name="TypeNameCheck">
-            <!-- Validates static, final fields against the
-            expression "^[A-Z][a-zA-Z0-9]*$". -->
-            <metadata name="altname" value="TypeName"/>
-            <property name="severity" value="warning"/>
-        </module>
-
-        <module name="ConstantNameCheck">
-            <!-- Validates non-private, static, final fields against the supplied
-            public/package final fields "^[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$". -->
-            <metadata name="altname" value="ConstantName"/>
-            <property name="applyToPublic" value="true"/>
-            <property name="applyToProtected" value="true"/>
-            <property name="applyToPackage" value="true"/>
-            <property name="applyToPrivate" value="false"/>
-            <property name="format" value="^([A-Z][A-Z0-9]*(_[A-Z0-9]+)*|FLAG_.*)$"/>
-            <message key="name.invalidPattern"
-                     value="Variable ''{0}'' should be in ALL_CAPS (if it is a constant) or be private (otherwise)."/>
-            <property name="severity" value="warning"/>
-        </module>
-
-        <module name="StaticVariableNameCheck">
-            <!-- Validates static, non-final fields against the supplied
-            expression "^[a-z][a-zA-Z0-9]*_?$". -->
-            <metadata name="altname" value="StaticVariableName"/>
-            <property name="applyToPublic" value="true"/>
-            <property name="applyToProtected" value="true"/>
-            <property name="applyToPackage" value="true"/>
-            <property name="applyToPrivate" value="true"/>
-            <property name="format" value="^[a-z][a-zA-Z0-9]*_?$"/>
-            <property name="severity" value="warning"/>
-        </module>
-
-        <module name="MemberNameCheck">
-            <!-- Validates non-static members against the supplied expression. -->
-            <metadata name="altname" value="MemberName"/>
-            <property name="applyToPublic" value="true"/>
-            <property name="applyToProtected" value="true"/>
-            <property name="applyToPackage" value="true"/>
-            <property name="applyToPrivate" value="true"/>
-            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
-            <property name="severity" value="warning"/>
-        </module>
-
-        <module name="MethodNameCheck">
-            <!-- Validates identifiers for method names. -->
-            <metadata name="altname" value="MethodName"/>
-            <property name="format" value="^[a-z][a-zA-Z0-9]*(_[a-zA-Z0-9]+)*$"/>
-            <property name="severity" value="warning"/>
-        </module>
-
-        <module name="ParameterName">
-            <!-- Validates identifiers for method parameters against the
-              expression "^[a-z][a-zA-Z0-9]*$". -->
-            <property name="severity" value="warning"/>
-        </module>
-
-        <module name="LocalFinalVariableName">
-            <!-- Validates identifiers for local final variables against the
-              expression "^[a-z][a-zA-Z0-9]*$". -->
-            <property name="severity" value="warning"/>
-        </module>
-
-        <module name="LocalVariableName">
-            <!-- Validates identifiers for local variables against the
-              expression "^[a-z][a-zA-Z0-9]*$". -->
-            <property name="severity" value="warning"/>
-        </module>
-
-
-        <!--
-
-        LENGTH and CODING CHECKS
-
-        -->
-
-        <module name="LineLength">
-            <!-- Checks if a line is too long. -->
-            <property name="max" value="${com.puppycrawl.tools.checkstyle.checks.sizes.LineLength.max}" default="128"/>
-            <property name="severity" value="error"/>
-
-            <!--
-              The default ignore pattern exempts the following elements:
-                - import statements
-                - long URLs inside comments
-            -->
-
-            <property name="ignorePattern"
-                      value="${com.puppycrawl.tools.checkstyle.checks.sizes.LineLength.ignorePattern}"
-                      default="^(package .*;\s*)|(import .*;\s*)|( *(\*|//).*https?://.*)$"/>
-        </module>
-
-        <module name="LeftCurly">
-            <!-- Checks for placement of the left curly brace ('{'). -->
-            <property name="severity" value="warning"/>
-        </module>
-
-        <module name="RightCurly">
-            <!-- Checks right curlies on CATCH, ELSE, and TRY blocks are on
-            the same line. e.g., the following example is fine:
-            <pre>
-              if {
-                ...
-              } else
-            </pre>
-            -->
-            <!-- This next example is not fine:
-            <pre>
-              if {
-                ...
-              }
-              else
-            </pre>
-            -->
-            <property name="option" value="same"/>
-            <property name="severity" value="warning"/>
-        </module>
-
-        <!-- Checks for braces around if and else blocks -->
-        <module name="NeedBraces">
-            <property name="severity" value="warning"/>
-            <property name="tokens" value="LITERAL_IF, LITERAL_ELSE, LITERAL_FOR, LITERAL_WHILE, LITERAL_DO"/>
-        </module>
-
-        <module name="UpperEll">
-            <!-- Checks that long constants are defined with an upper ell.-->
-            <property name="severity" value="error"/>
-        </module>
-
-        <module name="FallThrough">
-            <!-- Warn about falling through to the next case statement.  Similar to
-            javac -Xlint:fallthrough, but the check is suppressed if a single-line comment
-            on the last non-blank line preceding the fallen-into case contains 'fall through' (or
-            some other variants which we don't publicized to promote consistency).
-            -->
-            <property name="reliefPattern"
-                      value="fall through|Fall through|fallthru|Fallthru|falls through|Falls through|fallthrough|Fallthrough|No break|NO break|no break|continue on"/>
-            <property name="severity" value="error"/>
-        </module>
-
-
-        <!--
-
-        MODIFIERS CHECKS
-
-        -->
-
-        <module name="ModifierOrder">
-            <!-- Warn if modifier order is inconsistent with JLS3 8.1.1, 8.3.1, and
-                 8.4.3.  The prescribed order is:
-                 public, protected, private, abstract, static, final, transient, volatile,
-                 synchronized, native, strictfp
-              -->
-        </module>
-
-
-        <!--
-
-        WHITESPACE CHECKS
-
-        -->
-
-        <module name="WhitespaceAround">
-            <!-- Checks that various tokens are surrounded by whitespace.
-                 This includes most binary operators and keywords followed
-                 by regular or curly braces.
-            -->
-            <property name="tokens" value="ASSIGN, BAND, BAND_ASSIGN, BOR,
-        BOR_ASSIGN, BSR, BSR_ASSIGN, BXOR, BXOR_ASSIGN, COLON, DIV, DIV_ASSIGN,
-        EQUAL, GE, GT, LAND, LE, LITERAL_CATCH, LITERAL_DO, LITERAL_ELSE,
-        LITERAL_FINALLY, LITERAL_FOR, LITERAL_IF, LITERAL_RETURN,
-        LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_WHILE, LOR, LT, MINUS,
-        MINUS_ASSIGN, MOD, MOD_ASSIGN, NOT_EQUAL, PLUS, PLUS_ASSIGN, QUESTION,
-        SL, SL_ASSIGN, SR_ASSIGN, STAR, STAR_ASSIGN"/>
-            <property name="severity" value="error"/>
-        </module>
-
-        <module name="WhitespaceAfter">
-            <!-- Checks that commas, semicolons and typecasts are followed by
-                 whitespace.
-            -->
-            <property name="tokens" value="COMMA, SEMI, TYPECAST"/>
-        </module>
-
-        <module name="NoWhitespaceAfter">
-            <!-- Checks that there is no whitespace after various unary operators.
-                 Linebreaks are allowed.
-            -->
-            <property name="tokens" value="BNOT, DEC, DOT, INC, LNOT, UNARY_MINUS,
-        UNARY_PLUS"/>
-            <property name="allowLineBreaks" value="true"/>
-            <property name="severity" value="error"/>
-        </module>
-
-        <module name="NoWhitespaceBefore">
-            <!-- Checks that there is no whitespace before various unary operators.
-                 Linebreaks are allowed.
-            -->
-            <property name="tokens" value="SEMI, DOT, POST_DEC, POST_INC"/>
-            <property name="allowLineBreaks" value="true"/>
-            <property name="severity" value="error"/>
-        </module>
-
-        <module name="ParenPad">
-            <!-- Checks that there is no whitespace before close parens or after
-                 open parens.
-            -->
-            <property name="severity" value="warning"/>
-        </module>
-
-    </module>
-</module>
-

content-smile/src/main/java/module-info.java

@@ -1,7 +1,7 @@
 module org.xbib.content.smile {
     exports org.xbib.content.smile;
-    requires org.xbib.content.core;
+    requires transitive org.xbib.content.core;
-    requires com.fasterxml.jackson.dataformat.smile;
+    requires transitive com.fasterxml.jackson.dataformat.smile;
     provides org.xbib.content.XContent with
             org.xbib.content.smile.SmileXContent;
 }

content-xml/src/main/java/module-info.java

@@ -5,11 +5,10 @@ module org.xbib.content.xml {
     exports org.xbib.content.xml.stream;
     exports org.xbib.content.xml.transform;
     exports org.xbib.content.xml.util;
-    requires java.xml;
+    requires transitive java.xml;
-    requires org.xbib.content.core;
+    requires transitive org.xbib.content.core;
-    requires org.xbib.content.resource;
+    requires transitive org.xbib.content.resource;
-    requires com.fasterxml.jackson.core;
+    requires transitive com.fasterxml.jackson.dataformat.xml;
-    requires com.fasterxml.jackson.dataformat.xml;
     provides org.xbib.content.XContent with
             org.xbib.content.xml.XmlXContent;
 }

content-xml/src/main/java/org/xbib/content/xml/XmlXContent.java

@@ -22,7 +22,7 @@ public class XmlXContent implements XContent {
 
     private static XmlXContent xmlXContent;
 
-    private XmlFactory xmlFactory;
+    private final XmlFactory xmlFactory;
 
     /**
      * Public constructor, used by {@link java.util.ServiceLoader}.

content-yaml/build.gradle

@@ -1,4 +1,5 @@
 dependencies {
     api project(':content-core')
     api "com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:${project.property('jackson.version')}"
+    api "org.yaml:snakeyaml:${project.property('snakeyaml.version')}"
 }

content-yaml/src/main/java/module-info.java

@@ -1,7 +1,7 @@
 module org.xbib.content.yaml {
   exports org.xbib.content.yaml;
-  requires org.xbib.content.core;
+  requires transitive org.xbib.content.core;
-  requires com.fasterxml.jackson.dataformat.yaml;
+  requires transitive com.fasterxml.jackson.dataformat.yaml;
   provides org.xbib.content.XContent with
           org.xbib.content.yaml.YamlXContent;
   provides org.xbib.content.settings.SettingsLoader with

gradle.properties

@@ -1,12 +1,12 @@
 group = org.xbib
 name = content
-version = 2.2.0
+version = 2.3.0
 
 gradle.wrapper.version = 6.4.1
 xbib.net.version = 2.0.4
-jackson.version = 2.9.10
+jackson.version = 2.11.0
-jackson.databind.version = 2.9.10.1
+jackson.databind.version = 2.11.0
 woodstox.version = 6.2.1
-mockito.version = 3.1.0
+snakeyaml.version = 1.26
-junit4.version = 4.13
+mockito.version = 3.3.3
 asciidoclet.version = 1.5.6

gradle/compile/java.gradle

@@ -33,3 +33,11 @@ task javadocJar(type: Jar, dependsOn: javadoc) {
 artifacts {
     archives sourcesJar, javadocJar
 }
+
+tasks.withType(JavaCompile) {
+    options.compilerArgs << '-Xlint:all'
+}
+
+javadoc {
+    options.addStringOption('Xdoclint:none', '-quiet')
+}

gradle/quality/checkstyle.gradle

@@ -0,0 +1,27 @@
+apply plugin: 'checkstyle'
+
+checkstyle {
+    toolVersion '8.33'
+    showViolations = true
+    ignoreFailures = true
+    configFile rootProject.file("config/checkstyle/checkstyle.xml")
+}
+
+checkstyleMain {
+    exclude "**/module-info.java"
+    logging.setLevel(LogLevel.LIFECYCLE)
+    source ='src/main/java'
+}
+
+checkstyleTest {
+    exclude "**/module-info.java"
+    logging.setLevel(LogLevel.LIFECYCLE)
+    source ='src/test/java'
+}
+
+tasks.withType(Checkstyle) {
+    reports {
+        xml.enabled false
+        html.enabled true
+    }
+}

gradle/quality/pmd.gradle

@@ -0,0 +1,9 @@
+apply plugin: 'pmd'
+
+pmd {
+    ignoreFailures = true
+    consoleOutput = false
+    toolVersion = "6.24.0"
+    rulePriority = 5
+    ruleSets = ["category/java/errorprone.xml", "category/java/bestpractices.xml"]
+}

gradle/quality/spotbugs.gradle

@@ -0,0 +1,18 @@
+apply plugin: "com.github.spotbugs"
+
+spotbugs {
+    ignoreFailures = true
+}
+
+spotbugsMain {
+    reports {
+        html {
+            enabled = true
+            destination = file("$buildDir/reports/spotbugs/main/spotbugs.html")
+        }
+    }
+}
+
+spotbugsTest {
+    enabled = false
+}