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

[Grzegorz Słowikowski <gslowikowski@xxxxxxxxx>]

Hi

I have M2E 1.5.0.20131127-1501 installed and it contains "plexus-utils"
3.0.15
so there should not be any problems, but:

1. If the classloader separation is not implemented properly (maybe in
1.5 it is, I don't know)
similar problem may arise again some day.

2. I need 1.4.0 because I need Scala IDE (I have to write howto for my
plugin's users
and it must be as simple as possible) and latest Scala IDE 3.0.3 bundle
(http://scala-ide.org/download/sdk.html)
has M2E 1.4.
Now I will downgrade "plexus-utils" version in my plugin's pom.xml, but
is there better solution,
when still using M2E 1.4?

Regards
Grzegorz

On 2014-04-08 11:45, Igor Fedorenko wrote:
> Sounds like bug 422106 [1], see if m2e 1.5 M6 or latest snapshot work
> better.
>
> [1] https://bugs.eclipse.org/bugs/show_bug.cgi?id=422106
>
> -- 
> Regards,
> Igor
>
> On 2014-04-08, 13:21, Grzegorz Słowikowski 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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