[MCOMPILER-355] NPE in CompilerMojo.preparePaths on exception - ASF JIRA

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Details

Type: Bug
Status: Closed
Priority: Major
Resolution: Resolved
Affects Version/s: None
Fix Version/s: None
Labels:
None
Environment:
ubunutu 18.04.

Description

I'm getting:

 
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)

Appears to be caused by the exception handling assuming the 'cause' will be non-null:

line 244 is:

 243 Throwable cause = pathException.getValue().getCause();
 244 while ( cause.getCause() != null )
 245 { 
 246     cause = cause.getCause(); 
 247 }

Clearly in some cases pathException.getValue().getCause() is returning null.

This occurs when I try to build a java 10 project using:

mvn deploy

I've narrowed the problem down to this dependancy:

<!-- https://mvnrepository.com/artifact/org.javamoney/moneta --> <dependency>
 <groupId>org.javamoney</groupId>
 <artifactId>moneta</artifactId>
 <version>1.3</version>
 <type>pom</type>
 </dependency>

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:

<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>