diff --git a/build.gradle b/build.gradle
index 5d7c55d..05dceb5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,10 +1,13 @@
+
 plugins {
-    id "de.marcphilipp.nexus-publish" version "0.4.0"
-    id "io.codearte.nexus-staging" version "0.21.1"
-    id "org.cyclonedx.bom" version "1.7.2"
-    //id "com.github.spotbugs" version "5.0.13"
     id "checkstyle"
     id "pmd"
+    id 'maven-publish'
+    id 'signing'
+    id "io.github.gradle-nexus.publish-plugin" version "1.3.0"
+    id "com.github.spotbugs" version "5.0.14"
+    id "org.cyclonedx.bom" version "1.7.2"
+    id "org.xbib.gradle.plugin.asciidoctor" version "2.5.2.2"
 }
 
 wrapper {
@@ -27,17 +30,18 @@ ext {
     licenseUrl = 'http://www.apache.org/licenses/LICENSE-2.0.txt'
 }
 
-apply plugin: 'java-library'
+apply plugin: "io.github.gradle-nexus.publish-plugin"
 
 subprojects {
     apply from: rootProject.file('gradle/ide/idea.gradle')
-    apply from: rootProject.file('gradle/compile/java.gradle')
     apply from: rootProject.file('gradle/repositories/maven.gradle')
+    apply from: rootProject.file('gradle/compile/java.gradle')
     apply from: rootProject.file('gradle/test/junit5.gradle')
-    apply from: rootProject.file('gradle/publishing/publication.gradle')
-    //apply from: rootProject.file('gradle/quality/spotbugs.gradle')
+    apply from: rootProject.file('gradle/documentation/asciidoc.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/publish/maven.gradle')
 }
-apply from: rootProject.file('gradle/publishing/sonatype.gradle')
+apply from: rootProject.file('gradle/publish/sonatype.gradle')
 apply from: rootProject.file('gradle/quality/cyclonedx.gradle')
diff --git a/datastructures-raml/src/main/java/org/xbib/raml/internal/utils/xml/XMLChar.java b/datastructures-raml/src/main/java/org/xbib/raml/internal/utils/xml/XMLChar.java
index 1e2c588..a347a1c 100644
--- a/datastructures-raml/src/main/java/org/xbib/raml/internal/utils/xml/XMLChar.java
+++ b/datastructures-raml/src/main/java/org/xbib/raml/internal/utils/xml/XMLChar.java
@@ -529,7 +529,7 @@ public class XMLChar {
      * Check to see if a string is a valid NCName according to [4]
      * from the XML Namespaces 1.0 Recommendation
      *
-     * @param name string to check
+     * @param ncName string to check
      * @return true if name is a valid NCName
      */
     public static boolean isValidNCName(String ncName) {
diff --git a/datastructures-tiny/src/main/java/org/xbib/datastructures/tiny/IndexedMap.java b/datastructures-tiny/src/main/java/org/xbib/datastructures/tiny/IndexedMap.java
index e90b690..c737f85 100644
--- a/datastructures-tiny/src/main/java/org/xbib/datastructures/tiny/IndexedMap.java
+++ b/datastructures-tiny/src/main/java/org/xbib/datastructures/tiny/IndexedMap.java
@@ -16,6 +16,8 @@ public interface IndexedMap<K, V> extends Map<K, V> {
 
     V setValueAt(int index, V value);
 
+    V putIfNotNull(K key, V value);
+
     boolean isRemoved(int index);
 
     int rawSize();
diff --git a/datastructures-tiny/src/main/java/org/xbib/datastructures/tiny/IndexedMapBase.java b/datastructures-tiny/src/main/java/org/xbib/datastructures/tiny/IndexedMapBase.java
index e94a7a7..0249643 100644
--- a/datastructures-tiny/src/main/java/org/xbib/datastructures/tiny/IndexedMapBase.java
+++ b/datastructures-tiny/src/main/java/org/xbib/datastructures/tiny/IndexedMapBase.java
@@ -100,6 +100,11 @@ public abstract class IndexedMapBase<K, V> implements IndexedMap<K, V> {
         throw new UnsupportedOperationException("modification not supported: " + this);
     }
 
+    @Override
+    public V putIfNotNull(K key, V value) {
+        throw new UnsupportedOperationException("modification not supported: " + this);
+    }
+
     @Override
     public V remove(Object key) {
         int index = getIndex(key);
diff --git a/datastructures-tiny/src/main/java/org/xbib/datastructures/tiny/TinyMap.java b/datastructures-tiny/src/main/java/org/xbib/datastructures/tiny/TinyMap.java
index 3ee053b..c10e48b 100644
--- a/datastructures-tiny/src/main/java/org/xbib/datastructures/tiny/TinyMap.java
+++ b/datastructures-tiny/src/main/java/org/xbib/datastructures/tiny/TinyMap.java
@@ -90,6 +90,11 @@ public abstract class TinyMap<K, V> extends IndexedMapBase<K, V>  {
             return null;
         }
 
+        @Override
+        public V putIfNotNull(K key, V value) {
+            return value != null ? put(key, value) : null;
+        }
+
         @Override
         public int getIndex(Object key) {
             return keys.getIndex(key);
diff --git a/datastructures-tiny/src/test/java/org/xbib/datastructures/tiny/TinyMapTest.java b/datastructures-tiny/src/test/java/org/xbib/datastructures/tiny/TinyMapTest.java
index d22c523..95e4759 100644
--- a/datastructures-tiny/src/test/java/org/xbib/datastructures/tiny/TinyMapTest.java
+++ b/datastructures-tiny/src/test/java/org/xbib/datastructures/tiny/TinyMapTest.java
@@ -224,13 +224,21 @@ public class TinyMapTest {
         assertEquals(1, builder.build().size());
     }
 
+    @Test
+    public void testPutIfNotNull() {
+        TinyMap.Builder<String, Object> builder = TinyMap.builder();
+        builder.putIfNotNull("a", "b");
+        builder.putIfNotNull("c", null);
+        assertEquals(1, builder.build().size());
+    }
+
     private void testCount(int count, boolean withNull) {
         TinyMap.Builder<String, Object> builder = TinyMap.builder();
         LinkedHashMap<String, Object> expectedMap = new LinkedHashMap<>();
         for (int i = 0; i < count; i++) {
-            if (count < 1000)
+            if (count < 1000) {
                 builder.build();
-
+            }
             builder.putAll(Collections.singletonMap("aaa" + i, i));
             expectedMap.put("aaa" + i, i);
         }
diff --git a/datastructures-trie/src/main/java/org/xbib/datastructures/trie/concurrent/util/NodeUtil.java b/datastructures-trie/src/main/java/org/xbib/datastructures/trie/concurrent/util/NodeUtil.java
index f2489d7..98cbf82 100644
--- a/datastructures-trie/src/main/java/org/xbib/datastructures/trie/concurrent/util/NodeUtil.java
+++ b/datastructures-trie/src/main/java/org/xbib/datastructures/trie/concurrent/util/NodeUtil.java
@@ -38,7 +38,7 @@ public class NodeUtil {
      * the constraints documented in this method
      *
      * @param edgeFirstCharacter The first character of the edge for which the associated node is required
-     * @return The index of the node representing the indicated edge, or a value < 0 if no such node exists in the
+     * @return The index of the node representing the indicated edge, or a value &lt; 0 if no such node exists in the
      * array
      */
     public static int binarySearchForEdge(AtomicReferenceArray<Node> childNodes, Character edgeFirstCharacter) {
diff --git a/datastructures-validation/src/main/java/org/xbib/datastructures/validation/core/Validator.java b/datastructures-validation/src/main/java/org/xbib/datastructures/validation/core/Validator.java
index eab23da..c784ce0 100644
--- a/datastructures-validation/src/main/java/org/xbib/datastructures/validation/core/Validator.java
+++ b/datastructures-validation/src/main/java/org/xbib/datastructures/validation/core/Validator.java
@@ -125,11 +125,6 @@ public class Validator<T> implements Validatable<T> {
 		this.collectionValidators.forEach(action);
 	}
 
-	/**
-	 * This method is supposed to be used only internally.
-	 *
-	 * @param action callback per <code>Pair<ConstraintCondition<T>, Validator<T>></code>.
-	 */
 	public void forEachConditionalValidator(
 			Consumer<Pair<ConstraintCondition<T>, Validatable<T>>> action) {
 		this.conditionalValidators.forEach(action);
diff --git a/gradle.properties b/gradle.properties
index fbd93cc..16a3f2d 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,5 +1,5 @@
 group = org.xbib
 name = datastructures
-version = 2.1.0
+version = 2.3.0
 
 org.gradle.warning.mode = all
diff --git a/gradle/compile/java.gradle b/gradle/compile/java.gradle
index 6e70802..109698f 100644
--- a/gradle/compile/java.gradle
+++ b/gradle/compile/java.gradle
@@ -3,6 +3,8 @@ apply plugin: 'java-library'
 
 java {
     modularity.inferModulePath.set(true)
+    withSourcesJar()
+    withJavadocJar()
 }
 
 compileJava {
@@ -21,22 +23,6 @@ jar {
     }
 }
 
-task sourcesJar(type: Jar, dependsOn: classes) {
-    dependsOn classes
-    classifier 'sources'
-    from sourceSets.main.allSource
-}
-
-task javadocJar(type: Jar, dependsOn: javadoc) {
-    dependsOn javadoc
-    classifier 'javadoc'
-    from javadoc.destinationDir
-}
-
-artifacts {
-    archives sourcesJar, javadocJar
-}
-
 tasks.withType(JavaCompile) {
     options.compilerArgs.add('-Xlint:all')
     options.encoding = 'UTF-8'
diff --git a/gradle/publish/ivy.gradle b/gradle/publish/ivy.gradle
new file mode 100644
index 0000000..fe0a848
--- /dev/null
+++ b/gradle/publish/ivy.gradle
@@ -0,0 +1,27 @@
+apply plugin: 'ivy-publish'
+
+publishing {
+    repositories {
+        ivy {
+            url = "https://xbib.org/repo"
+        }
+    }
+    publications {
+        ivy(IvyPublication) {
+            from components.java
+            descriptor {
+                license {
+                    name = 'The Apache License, Version 2.0'
+                    url = 'http://www.apache.org/licenses/LICENSE-2.0.txt'
+                }
+                author {
+                    name = 'Jörg Prante'
+                    url = 'http://example.com/users/jane'
+                }
+                descriptor.description {
+                    text = rootProject.ext.description
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/gradle/publishing/publication.gradle b/gradle/publish/maven.gradle
similarity index 72%
rename from gradle/publishing/publication.gradle
rename to gradle/publish/maven.gradle
index e2ebd02..ce6a26f 100644
--- a/gradle/publishing/publication.gradle
+++ b/gradle/publish/maven.gradle
@@ -1,14 +1,10 @@
-import java.time.Duration
-
-apply plugin: "de.marcphilipp.nexus-publish"
 
 publishing {
     publications {
-        mavenJava(MavenPublication) {
+        "${project.name}"(MavenPublication) {
             from components.java
-            artifact sourcesJar
-            artifact javadocJar
             pom {
+                artifactId = project.name
                 name = project.name
                 description = rootProject.ext.description
                 url = rootProject.ext.url
@@ -50,19 +46,6 @@ publishing {
 if (project.hasProperty("signing.keyId")) {
     apply plugin: 'signing'
     signing {
-        sign publishing.publications.mavenJava
-    }
-}
-
-if (project.hasProperty("ossrhUsername")) {
-    nexusPublishing {
-        repositories {
-            sonatype {
-                username = project.property('ossrhUsername')
-                password = project.property('ossrhPassword')
-                packageGroup = "org.xbib"
-            }
-        }
-        clientTimeout = Duration.ofSeconds(600)
+        sign publishing.publications."${project.name}"
     }
 }
diff --git a/gradle/publish/sonatype.gradle b/gradle/publish/sonatype.gradle
new file mode 100644
index 0000000..02744cd
--- /dev/null
+++ b/gradle/publish/sonatype.gradle
@@ -0,0 +1,12 @@
+
+if (project.hasProperty('ossrhUsername') && project.hasProperty('ossrhPassword')) {
+    nexusPublishing {
+        repositories {
+            sonatype {
+                username = project.property('ossrhUsername')
+                password = project.property('ossrhPassword')
+                packageGroup = "org.xbib"
+            }
+        }
+    }
+}
diff --git a/gradle/publishing/sonatype.gradle b/gradle/publishing/sonatype.gradle
deleted file mode 100644
index e85081d..0000000
--- a/gradle/publishing/sonatype.gradle
+++ /dev/null
@@ -1,12 +0,0 @@
-import java.time.Duration
-
-if (project.hasProperty('ossrhUsername') && project.hasProperty('ossrhPassword')) {
-
-    apply plugin: 'io.codearte.nexus-staging'
-
-    nexusStaging {
-        username = project.property('ossrhUsername')
-        password = project.property('ossrhPassword')
-        packageGroup = "org.xbib"
-    }
-}
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 249e583..c1962a7 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 8fad3f5..8707e8b 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.1.1-all.zip
+networkTimeout=10000
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
index a69d9cb..aeb74cb 100755
--- a/gradlew
+++ b/gradlew
@@ -55,7 +55,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
@@ -80,13 +80,10 @@ do
     esac
 done
 
-APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
-
-APP_NAME="Gradle"
+# This is normally unused
+# shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
-
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
@@ -143,12 +140,16 @@ fi
 if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
     case $MAX_FD in #(
       max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
         MAX_FD=$( ulimit -H -n ) ||
             warn "Could not query maximum file descriptor limit"
     esac
     case $MAX_FD in  #(
       '' | soft) :;; #(
       *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
         ulimit -n "$MAX_FD" ||
             warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
@@ -193,6 +194,10 @@ if "$cygwin" || "$msys" ; then
     done
 fi
 
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
 # Collect all arguments for the java command;
 #   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
 #     shell script including quotes and variable substitutions, so put them in
diff --git a/gradlew.bat b/gradlew.bat
index 53a6b23..6689b85 100644
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -26,6 +26,7 @@ if "%OS%"=="Windows_NT" setlocal
 
 set DIRNAME=%~dp0
 if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
diff --git a/settings.gradle b/settings.gradle
index 6127a57..cde0948 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -15,8 +15,8 @@ pluginManagement {
 dependencyResolutionManagement {
     versionCatalogs {
         libs {
-            version('gradle', '7.5.1')
-            version('junit', '5.9.1')
+            version('gradle', '8.1.1')
+            version('junit', '5.9.2')
             version('jackson', '2.12.7')
             library('junit-jupiter-api', 'org.junit.jupiter', 'junit-jupiter-api').versionRef('junit')
             library('junit-jupiter-params', 'org.junit.jupiter', 'junit-jupiter-params').versionRef('junit')