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Re: [m2e-dev] m2e 1.4.0 strance classloader bug
Hi

Tested with Scala IDE 3.0.3 bundle based on Eclipse 4.3.1 (see http://scala-ide.org/download/sdk.html for details).

Regards
Grzegorz

On 2014-04-08 11:47, Anders Hammar wrote:
I believe I've run into something similar.
What version of Eclipse are you using? In my case I was using a very old version of Eclipse (Helios as used by RAD8) and it seemed to be related to that. Didn't dig deeper into it though but solved it by downgrading the plexus-utils dependency to v3.0.4.

/Anders


On Tue, Apr 8, 2014 at 11:21 AM, Grzegorz Słowikowski <gslowikowski@xxxxxxxxx> wrote:
Hi

I found strange classloader bug testing my plugin with M2Eclipse.

My mojo uses plexus-utils DirectoryScanner class. Plexus-utils
dependency version is "3.0.17".
When my mojo executes I have this exception:

Description    Resource    Path    Location    Type
Execution default-routes-compile of goal
com.google.code.play2-maven-plugin:play2-maven-plugin:1.0.0-alpha6-SNAPSHOT:routes-compile
failed: An API incompatibility was encountered while executing
com.google.code.play2-maven-plugin:play2-maven-plugin:1.0.0-alpha6-SNAPSHOT:routes-compile:
java.lang.NoSuchMethodError:
org.codehaus.plexus.util.DirectoryScanner.setupMatchPatterns()V
-----------------------------------------------------
realm =
plugin>com.google.code.play2-maven-plugin:play2-maven-plugin:1.0.0-alpha6-SNAPSHOT
strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
urls[0] =
file:/d:/home/gs/.m2/repository/com/google/code/play2-maven-plugin/play2-maven-plugin/1.0.0-alpha6-SNAPSHOT/play2-maven-plugin-1.0.0-alpha6-SNAPSHOT.jar
urls[1] =
file:/d:/home/gs/.m2/repository/com/google/code/play2-maven-plugin/play2-provider-api/1.0.0-alpha6-SNAPSHOT/play2-provider-api-1.0.0-alpha6-SNAPSHOT.jar
urls[2] =
file:/d:/home/gs/.m2/repository/org/apache/ant/ant/1.9.0/ant-1.9.0.jar
urls[3] =
file:/d:/home/gs/.m2/repository/org/apache/ant/ant-launcher/1.9.0/ant-launcher-1.9.0.jar
urls[4] =
file:/d:/home/gs/.m2/repository/com/typesafe/config/1.2.0/config-1.2.0.jar
urls[5] =
file:/d:/home/gs/.m2/repository/backport-util-concurrent/backport-util-concurrent/3.1/backport-util-concurrent-3.1.jar
urls[6] =
file:/d:/home/gs/.m2/repository/org/codehaus/plexus/plexus-interpolation/1.11/plexus-interpolation-1.11.jar
urls[7] = file:/d:/home/gs/.m2/repository/junit/junit/3.8.1/junit-3.8.1.jar
urls[8] =
file:/d:/home/gs/.m2/repository/org/apache/maven/shared/maven-common-artifact-filters/1.4/maven-common-artifact-filters-1.4.jar
urls[9] =
file:/d:/home/gs/.m2/repository/org/codehaus/plexus/plexus-archiver/2.3/plexus-archiver-2.3.jar
urls[10] =
file:/d:/home/gs/.m2/repository/org/codehaus/plexus/plexus-io/2.0.6/plexus-io-2.0.6.jar
urls[11] =
file:/d:/home/gs/.m2/repository/org/codehaus/plexus/plexus-utils/3.0.17/plexus-utils-3.0.17.jar
Number of foreign imports: 4
import: Entry[import org.sonatype.plexus.build.incremental from realm
ClassRealm[plexus.core, parent: null]]
import: Entry[import org.codehaus.plexus.util.Scanner from realm
ClassRealm[plexus.core, parent: null]]
import: Entry[import org.codehaus.plexus.util.AbstractScanner from realm
ClassRealm[plexus.core, parent: null]]
import: Entry[import  from realm
ClassRealm[project>com.google.code.play2-maven-plugin.test-projects.play22.scala:helloworld:1.0.0-alpha6-SNAPSHOT,
parent: ClassRealm[maven.api, parent: null]]]

-----------------------------------------------------
 (com.google.code.play2-maven-plugin:play2-maven-plugin:1.0.0-alpha6-SNAPSHOT:routes-compile:default-routes-compile:generate-sources)
pom.xml    /helloworld-1.0.0-alpha6-SNAPSHOT    line 90    Maven Build
Problem

I found the reason, but don't know what is the proper path to solve this.
The reason is "org.codehaus.plexus.util.DirectoryScanner" class is
loaded by

ClassRealm[plugin>com.google.code.play2-maven-plugin:play2-maven-plugin:1.0.0-alpha6-SNAPSHOT,
parent: sun.misc.Launcher$AppClassLoader@aa4c7c]

and it's base class "org.codehaus.plexus.util.AbstractScanner" is loaded by

org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader@107a705[org.eclipse.m2e.maven.runtime:1.4.0.20130531-2315(id=195)]

M2Eclipse bundled version is 2.0.6.

When I call DirectoryScanner.scan(), it calls "setupMatchPatterns()"
method. This method was introduced in AbstractScanner class in
plexus-utils version 3.0.5
so it's not there in version 2.0.6.

If I downgrade "plexus-utils" dependency version in my plugin's pom.xml,
it works, but I don't like this solution. Is there any better? Or maybe
this problem has been
already solved.

You can reproduce this problem for example by importing
https://play2-maven-plugin.googlecode.com/svn/trunk/test-projects/play22/scala/helloworld
example project.
My Maven plugin's sources are here:
https://play2-maven-plugin.googlecode.com/svn/trunk/plugin/play2-maven-plugin
The first mojo executed in M2Eclipse configuration build is:
http://play2-maven-plugin.googlecode.com/svn/trunk/plugin/play2-maven-plugin/src/main/java/com/google/code/play2/plugin/Play2RoutesCompileMojo.java
(it uses DirectoryScanner).

Thanks in advance.

Grzegorz Slowikowski





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