"The PluginDescriptor not found" error when executing copy-resources maven-resources-plugin's goal

Question

As part of my pom.xml I copy some extra resources to the target directory as follows.

 <plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-resources-plugin</artifactId>
  <version>2.4.1</version>
  <executions>
   <execution>
 <id>copy-package-doc</id>
 <phase>package</phase>
 <goals>
  <goal>copy-resources</goal>
 </goals>
 <configuration>
  <outputDirectory>${project.build.directory}/package/${project.artifactId}-${project.version}/doc</outputDirectory>
  <nonFilteredFileExtensions>
   <nonFilteredFileExtension>doc</nonFilteredFileExtension>
  </nonFilteredFileExtensions>
  <resources>
   <resource>
    <directory>doc</directory>
    <filtering>true</filtering>
    <includes>
  <include>**/*.doc</include>
    </includes>
    <excludes>
  <exclude>**/~*.doc</exclude>
    </excludes>
   </resource>
  </resources>
 </configuration>
   </execution>
   <execution>
 <id>copy-package-config</id>
 <phase>package</phase>
 <goals>
  <goal>copy-resources</goal>
 </goals>
 <configuration>
  <outputDirectory>${project.build.directory}/package/${project.artifactId}-${project.version}</outputDirectory>
  <resources>
   <resource>
    <directory>config</directory>
    <filtering>true</filtering>
   </resource>
  </resources>
 </configuration>
   </execution>
  </executions>
 </plugin>

When I package artifact I get error:

The PluginDescriptor for the plugin org.apache.maven.plugins:maven-resources-plugin was not found. Should have been in realm: ClassRealm[/plugins/org.apache.maven.plugins:maven-resources-plugin:2.4.1@48/thread:Worker-17, parent: null]

How to fix that? Why I get this error?

Thanks, Rafal

Answer 1

Include info on version used for: eclipse, java, maven

Try running mvn package -U -e and include output on pastebin.

Also try using another version of resources-plugin <version>2.3</version> or why do you need 2.4.1

---

Sounds like you got a corrupted maven plugin

Try deleting the folder maven-resources-plugin contained in .m2/repository/org/apache/maven

Or post (or include link to) whole error message

Answer 2

I have deleted .m2\repository\org\apache\maven\plugins\maven-resources-plugin but this haven't help.

I am using Q for Eclipse plugin. When I execute package artifact I get following output:

13:54:05 CET Starting Starting mavenExecution E:\projects\src-java\myproject
13:54:05 CET Starting Starting reactorExecution E:\projects\src-java\myproject
13:54:05 CET info Scanning for projects... 
13:54:05 CET Starting Starting projectExecution myproject
Id: erchu:erchu.myproject:jar:1.0
task-segment: [package]
13:54:09 CET info Attempting to resolve a version for plugin: org.bluestemsoftware.open.maven.plugin:launch4j-plugin using meta-version: LATEST 
13:54:09 CET info Using version: 1.0.0.3 of plugin: org.bluestemsoftware.open.maven.plugin:launch4j-plugin 
13:54:10 CET Starting Starting phaseExecution process-resources
13:54:10 CET Starting Starting mojoExecution resources:resources
13:54:10 CET warn Using platform encoding (Cp1250 actually) to copy filtered resources, i.e. build is platform dependent! 
13:54:10 CET info Copying 4 resources 
13:54:10 CET Finished Finished mojoExecution resources:resources
13:54:10 CET Finished Finished phaseExecution process-resources
13:54:10 CET Starting Starting phaseExecution compile
13:54:11 CET Starting Starting mojoExecution compiler:compile
13:54:11 CET info Nothing to compile - all classes are up to date 
13:54:11 CET Finished Finished mojoExecution compiler:compile
13:54:11 CET Finished Finished phaseExecution compile
13:54:11 CET Starting Starting phaseExecution process-test-resources
13:54:11 CET Starting Starting mojoExecution resources:testResources
13:54:11 CET warn Using platform encoding (Cp1250 actually) to copy filtered resources, i.e. build is platform dependent! 
13:54:11 CET info Copying 3 resources 
13:54:11 CET Finished Finished mojoExecution resources:testResources
13:54:11 CET Finished Finished phaseExecution process-test-resources
13:54:11 CET Starting Starting phaseExecution test-compile
13:54:11 CET Starting Starting mojoExecution compiler:testCompile
13:54:11 CET info Nothing to compile - all classes are up to date 
13:54:11 CET Finished Finished mojoExecution compiler:testCompile
13:54:11 CET Finished Finished phaseExecution test-compile
13:54:11 CET Starting Starting phaseExecution test
13:54:11 CET Starting Starting mojoExecution surefire:test
13:54:11 CET info Tests are skipped. 
13:54:11 CET Finished Finished mojoExecution surefire:test
13:54:11 CET Finished Finished phaseExecution test
13:54:11 CET Starting Starting phaseExecution package
13:54:11 CET Starting Starting mojoExecution jar:jar
13:54:11 CET info Building jar: E:\projects\src-java\myproject\target\package\erchu.myproject-1.0\lib\erchu.myproject-1.0.jar 
13:54:11 CET Finished Finished mojoExecution jar:jar
13:54:11 CET Starting Starting mojoExecution dependency:copy-dependencies
13:54:11 CET info antlr-2.7.6.jar already exists in destination. 
13:54:11 CET info aopalliance-1.0.jar already exists in destination. 
13:54:11 CET info asm-3.1.jar already exists in destination. 
13:54:11 CET info cglib-2.2.jar already exists in destination. 
13:54:11 CET info commons-collections-3.1.jar already exists in destination. 
13:54:11 CET info commons-logging-1.1.1.jar already exists in destination. 
13:54:11 CET info dom4j-1.6.1.jar already exists in destination. 
13:54:11 CET info htmlcleaner-2.1.jar already exists in destination. 
13:54:11 CET info javassist-3.8.0.GA.jar already exists in destination. 
13:54:11 CET info jta-1.1.jar already exists in destination. 
13:54:11 CET info junit-4.4.jar already exists in destination. 
13:54:11 CET info log4j-1.2.14.jar already exists in destination. 
13:54:11 CET info jtds-1.2.2.jar already exists in destination. 
13:54:11 CET info commons-io-1.3.2.jar already exists in destination. 
13:54:11 CET info commons-dbcp-all-1.3.jar already exists in destination. 
13:54:11 CET info easymock-2.4.jar already exists in destination. 
13:54:11 CET info ejb3-persistence-1.0.2.GA.jar already exists in destination. 
13:54:11 CET info hibernate-annotations-3.4.0.GA.jar already exists in destination. 
13:54:11 CET info hibernate-commons-annotations-3.1.0.GA.jar already exists in destination. 
13:54:11 CET info hibernate-core-3.3.0.SP1.jar already exists in destination. 
13:54:11 CET info hibernate-jmx-3.3.2.GA.jar already exists in destination. 
13:54:11 CET info slf4j-api-1.5.6.jar already exists in destination. 
13:54:11 CET info slf4j-log4j12-1.5.6.jar already exists in destination. 
13:54:11 CET info spring-aop-2.5.6.jar already exists in destination. 
13:54:11 CET info spring-beans-2.5.6.jar already exists in destination. 
13:54:11 CET info spring-context-2.5.6.jar already exists in destination. 
13:54:11 CET info spring-core-2.5.6.jar already exists in destination. 
13:54:11 CET info spring-jdbc-2.5.6.jar already exists in destination. 
13:54:11 CET info spring-orm-2.5.6.jar already exists in destination. 
13:54:11 CET info spring-test-2.5.6.jar already exists in destination. 
13:54:11 CET info spring-tx-2.5.6.jar already exists in destination. 
13:54:11 CET info xml-apis-1.0.b2.jar already exists in destination. 
13:54:11 CET Finished Finished mojoExecution dependency:copy-dependencies
13:54:12 CET Starting Starting mojoExecution launch4j:launch4j
13:54:12 CET info Platform-specific work directory already exists: C:\Documents and Settings\rach\.m2\repository\org\bluestemsoftware\open\maven\plugin\launch4j-plugin\1.0.0.3 
13:54:12 CET info launch4j: Compiling resources 
13:54:12 CET info launch4j: Linking 
13:54:12 CET info launch4j: Successfully created E:\projects\src-java\myproject\target\package\erchu.myproject-1.0\myproject.exe 
13:54:12 CET Finished Finished mojoExecution launch4j:launch4j
13:54:12 CET Starting Starting mojoExecution resources:copy-resources
13:54:12 CET warn File encoding has not been set, using platform encoding Cp1250, i.e. build is platform dependent! 
13:54:12 CET warn Using platform encoding (Cp1250 actually) to copy filtered resources, i.e. build is platform dependent! 
13:54:12 CET info Copying 2 resources 
13:54:12 CET Finished Finished mojoExecution resources:copy-resources
13:54:12 CET Starting Starting mojoExecution resources:copy-resources
13:54:12 CET warn File encoding has not been set, using platform encoding Cp1250, i.e. build is platform dependent! 
13:54:12 CET warn Using platform encoding (Cp1250 actually) to copy filtered resources, i.e. build is platform dependent! 
13:54:12 CET info Copying 1 resource 
13:54:12 CET Finished Finished mojoExecution resources:copy-resources
13:54:12 CET Starting Starting mojoExecution assembly:single
13:54:12 CET info Reading assembly descriptor: E:\projects\src-java\myproject\assembly.xml 
13:54:12 CET info Building zip: E:\projects\src-java\myproject\dist\erchu.myproject-1.0-dist.zip 
13:54:14 CET Finished Finished mojoExecution assembly:single
13:54:14 CET Finished Finished phaseExecution package
13:54:14 CET Finished Finished projectExecution myproject
Id: erchu:erchu.myproject:jar:1.0
task-segment: [package]
13:54:14 CET Finished Finished mavenExecution E:\projects\src-java\myproject
13:54:14 CET Finished Finished reactorExecution E:\projects\src-java\myproject

Whole error message from "Problems" view in Eclipse:

Description Resource Path Location Type
The PluginDescriptor for the plugin org.apache.maven.plugins:maven-resources-plugin was not found. Should have been in realm: ClassRealm[/plugins/org.apache.maven.plugins:maven-resources-plugin:2.4.1@48/thread:Worker-4, parent: null] pom.xml /myproject line 1 pomproblemmarker

Answer 3

I've seen lots of similar issues on the web (e.g. in IDEA-16866, IDEADEV-24376, MIDEA-109 or this one about Eclipse/IAM which seems to be the closest). In all cases, this seems related to Maven Embedder.

I have actually no idea of the cause of the problem and have no better suggestion than to use the latest version of maven (2.2.1) if it's not the case and/or to try with previous versions of the maven-resources-plugin (2.3) to verify that this is not a regression.

If this doesn't work, go the Maven 2.x Resources Plugin Jira and open an issue.

Answer 4

I have switched from Q for Eclipse to M2Eclipse and this solved my problem.