Maven - ClassNotFoundException: org.apache.commons.lang.StringUtils

Question

Can someone please explain what this error is and when it occurs?

Downloading: file://C:/.../org/springframework/boot/spring-boot-dependencies/1.4.0.RELEASE/spring-boot-dependencies-1.4.0.RELEASE.pom
Exception in thread "pool-11-thread-1" ---------------------------------------------------
constituent[0]: file:/C:/Program%20Files/NetBeans%208.2/java/maven/lib/aether-api-1.13.1.jar
constituent[1]: file:/C:/Program%20Files/NetBeans%208.2/java/maven
constituent[18]: file:/C:/Program%20Files/NetBeans%208.2/java/maven/lib/plexus-component-annotations-1.5.5.jar
constituent[19]: file:/C:/Program%20Files/NetBeans%208.2/java/maven/lib/plexus-interpolation-1.14.jarjava.lang.NoClassDefFoundError: org/apache/commons/lang/StringUtils
    at org.apache.maven.wagon.providers.file.FileWagon.resolveDestinationPath(FileWagon.java:206)
    at org.apache.maven.wagon.providers.file.FileWagon.resourceExists(FileWagon.java:265)
    at org.sonatype.aether.connector.wagon.WagonRepositoryConnector$GetTask.run(WagonRepositoryConnector.java:577)
    at org.sonatype.aether.util.concurrency.RunnableErrorForwarder$1.run(RunnableErrorForwarder.java:60)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang.StringUtils
    at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50)
    at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:244)
    at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:230)
    ... 7 more

Why maven can not find org.apache.commons.lang.StringUtils. Looking into local repository I'm able to find org\apache\maven\wagon\wagon-providers\2.7\... and org\apache\commons\parent\..., org\apache\commons\lang\..., org\apache\commons\exec\..., org\apache\commons\compress\..., org\apache\commons\pool2\.... I can not figure out when this problem occurs, so I'm not able to resolve this problem...

your classpath is broken try to rebuild the project and maven update — Khalil M
– Khalil M, Commented Aug 9, 2017 at 11:27
Is your M2_HOME pointing to the same location as the Maven executable? — Tome
– Tome, Commented Aug 9, 2017 at 12:12

LeckerMaedschen · Accepted Answer · 2017-08-10 07:00:18Z

3

Fixed! I have downloaded manually maven 3.5 under https://maven.apache.org/download.cgi and copied file commons-lang3-3.5.jar to C:\Program Files\NetBeans 8.2\java\maven\lib\. I'm using NetBeans 8.2 with Maven as Plug-In.

edited Aug 10, 2017 at 7:00

answered Aug 9, 2017 at 12:14

LeckerMaedschen

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7 Comments

diginoise Over a year ago

please keep in mind that commons-lang is a dependency of your application, not of maven embedded in NetBeans. It will work, but will you always drop all dependencies to NetBeans\maven\lib when you need to build something? It will quickly become unruly. Fixing your maven settings and/or pom file for the project should be your solution.

LeckerMaedschen Over a year ago

Why do u think, I need to drop all deps from my application to NetBeans\maven\lib. This is not correct. Here are all deps for maven placed. So there is no need to add used deps to build projects into it.

LeckerMaedschen Over a year ago

This is even my opinion. I'm doing nothing else. But for some reason maven is using common-lang internal. Including it to the application pom's does not resolve my problem. Edit: commons-lang is used internal and it is in my case not a dep from my application.

Ryan Over a year ago

Not sure what @diginoise is hating on. I just encountered this exception using Netbeans 8.2 and the bundled maven that comes with it. Copying commons-lang2.6.jar to C:\Program Files\NetBeans 8.2\java\maven\lib\ fixed it for me.

Ryan Over a year ago

@diginoise I don't depend on commons-lang2.6. Look at the stacktrace - the exception is coming out of the maven process itself.

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Danylo Zatorsky · Accepted Answer · 2017-08-09 18:41:12Z

0

Try adding this dependency in your pom.xml:

<dependency>
    <groupId>commons-lang</groupId>
    <artifactId>commons-lang</artifactId>
    <version>2.6</version>
</dependency>

answered Aug 9, 2017 at 18:41

Danylo Zatorsky

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