[jira] [Comment Edited] (MCOMPILER-355) NPE in CompilerMojo.preparePaths on exception

["Gregor B. Rosenauer (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MCOMPILER-355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16818800#comment-16818800 ] 

Gregor B. Rosenauer edited comment on MCOMPILER-355 at 4/16/19 9:07 AM:
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With a Java 11 project and a dependency to Stardog triple store driver, I also ran into this issue (project worked before), using maven 3.6.1 and maven-compile-plugin 3.8.0:

{{<dependency>}}
  <groupId>com.complexible.stardog</groupId>
  <artifactId>stardog-api</artifactId>
  <version>5.3.1</version>
 {{</dependency>}}


was (Author: grexe):
With a Java 11 project and a dependency to Stardog triple store driver, I also ran into this issue (project worked before), using maven 3.6.1 and maven-compile-plugin 3.8.0:

{{<dependency>}}
{{ <groupId>com.complexible.stardog</groupId>}}
{{ <artifactId>stardog-api</artifactId>}}
{{ <version>5.3.1</version>}}
{{</dependency>}}

> NPE in CompilerMojo.preparePaths on exception
> ---------------------------------------------
>
>                 Key: MCOMPILER-355
>                 URL: https://issues.apache.org/jira/browse/MCOMPILER-355
>             Project: Maven Compiler Plugin
>          Issue Type: Bug
>         Environment: ubunutu 18.04.
>            Reporter: Brett Sutton
>            Assignee: Robert Scholte
>            Priority: Major
>         Attachments: testpom.zip
>
>
> I'm getting:
>  
> {code:java}
>  
> Caused by: java.lang.NullPointerException
>  at org.apache.maven.plugin.compiler.CompilerMojo.preparePaths (CompilerMojo.java:244)
>  at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute (AbstractCompilerMojo.java:787)
>  at org.apache.maven.plugin.compiler.CompilerMojo.execute (CompilerMojo.java:188)
>  at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:134)
>  at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
>  at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:154)
> {code}
>  
> Appears to be caused by the exception handling assuming the 'cause' will be non-null:
>     line 244 is:   
> {code:java}
>  243 Throwable cause = pathException.getValue().getCause();
>  244 while ( cause.getCause() != null )
>  245 { 
>  246     cause = cause.getCause(); 
>  247 }{code}
>  
> Clearly in some cases pathException.getValue().getCause() is returning null.
>  This occurs when I try to build a java 10 project using:
> {code:java}
> mvn deploy{code}
>  
> I've narrowed the problem down to this dependancy:
> {code:java}
> <!-- https://mvnrepository.com/artifact/org.javamoney/moneta --> <dependency>
>  <groupId>org.javamoney</groupId>
>  <artifactId>moneta</artifactId>
>  <version>1.3</version>
>  <type>pom</type>
>  </dependency>{code}
>  If you remove the above dependency then the problem goes away.
> So there is likely to be two problems here. The initial NPE which should be easy to fix and then possibly the root cause of the exception.
> Full pom is:
> {code:java}
> <project xmlns="http://maven.apache.org/POM/4.0.0"
>  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
>  <modelVersion>4.0.0</modelVersion>
>  <groupId>au.com.noojee</groupId>
>  <artifactId>noojeebilling.api</artifactId>
>  <version>1.4-SNAPSHOT</version>
>  <properties>
>  </properties>
>  <build>
>  <sourceDirectory>src/main/java</sourceDirectory>
>  <plugins>
>  <plugin>
>  <artifactId>maven-compiler-plugin</artifactId>
>  <version>3.8.0</version>
>  <configuration>
>  <release>10</release>
>  </configuration>
>  </plugin>
>  </plugins>
> <extensions>
>  <extension>
>  <groupId>io.packagecloud.maven.wagon</groupId>
>  <artifactId>maven-packagecloud-wagon</artifactId>
>  <version>0.0.6</version>
>  </extension>
>  </extensions>
>  </build>
> <distributionManagement>
>  <repository>
>  <id>noojee-internal</id>
>  <url>packagecloud+https://packagecloud.io/noojee/internal</url>
>  </repository>
>  <snapshotRepository>
>  <id>noojee-internal</id>
>  <url>packagecloud+https://packagecloud.io/noojee/internal</url>
>  </snapshotRepository>
>  </distributionManagement>
>  
> <dependencies>
>  <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
>  <dependency>
>  <groupId>com.google.code.gson</groupId>
>  <artifactId>gson</artifactId>
>  <version>2.8.5</version>
>  </dependency>
> <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
>  <dependency>
>  <groupId>org.apache.logging.log4j</groupId>
>  <artifactId>log4j-core</artifactId>
>  <version>2.9.1</version>
>  </dependency>
> <!-- https://mvnrepository.com/artifact/org.javamoney/moneta -->
>  <dependency>
>  <groupId>org.javamoney</groupId>
>  <artifactId>moneta</artifactId>
>  <version>1.3</version>
>  <type>pom</type>
>  </dependency>
>  <!-- https://mvnrepository.com/artifact/org.bouncycastle/bcprov-jdk15on -->
>  <dependency>
>  <groupId>org.bouncycastle</groupId>
>  <artifactId>bcprov-jdk15on</artifactId>
>  <version>1.59</version>
>  </dependency>
> <dependency>
>  <groupId>junit</groupId>
>  <artifactId>junit</artifactId>
>  <version>4.11</version>
>  <scope>test</scope>
>  </dependency>
>  
> </dependencies>
> </project>
> {code}
>  
>  
>  
>  
>  
>  



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