The error java.lang.NoClassDefFoundError: org/dom4j/DocumentException or ClassNotFoundException occurs when your Java project requires the library to parse or manipulate XML but cannot find the necessary JAR file in the classpath. This is a common issue when using libraries like Hibernate or Apache POI , which depend on dom4j internally.
org.dom4j dom4j 2.1.4 Use code with caution. : implementation 'org.dom4j:dom4j:2.1.4' Use code with caution. org/dom4j/documentexception jar download
If you are not using a build tool like Maven or Gradle, you can download the JAR manually from the official dom4j website . : Look for dom4j-x.x.x.jar . The error java
: Avoid downloading the -sources.jar or -javadoc.jar for your classpath, as these do not contain the compiled .class files required for execution. 3. How to Install the JAR in Your IDE : implementation 'org