I recently upgraded a few projects to Java 8 and the Cobertura instrumentation stopped working with a bunch of warnings similar to the following:
[cobertura] WARN [main] net.sourceforge.cobertura.instrument.CoberturaInstrumenter - Unable to instrument file /home/user/workspace/cache/target/generated-classes/cobertura/com/test/cache/Cache.class
java.lang.IllegalArgumentException
at org.objectweb.asm.ClassReader.<init>(Unknown Source)
at org.objectweb.asm.ClassReader.<init>(Unknown Source)
at org.objectweb.asm.ClassReader.<init>(Unknown Source)
at net.sourceforge.cobertura.instrument.CoberturaInstrumenter.instrumentClass(CoberturaInstrumenter.java:147)
at net.sourceforge.cobertura.instrument.CoberturaInstrumenter.instrumentClass(CoberturaInstrumenter.java:121)
at net.sourceforge.cobertura.instrument.CoberturaInstrumenter.addInstrumentationToSingleClass(CoberturaInstrumenter.java:234)
at net.sourceforge.cobertura.instrument.Main.addInstrumentationToSingleClass(Main.java:298)
at net.sourceforge.cobertura.instrument.Main.addInstrumentation(Main.java:307)
at net.sourceforge.cobertura.instrument.Main.parseArguments(Main.java:399)
at net.sourceforge.cobertura.instrument.Main.main(Main.java:421)
I'm not sure what the state of the Cobertura and cobertura-maven-plugin projects are, but for my projects I found that manually setting the version for the ASM Core dependency to 5.0.3 gets Cobertura working again. Here are the important parts from the pom.xml:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>cobertura-maven-plugin</artifactId>
<version>2.6</version>
<dependencies>
<dependency>
<groupId>org.ow2.asm</groupId>
<artifactId>asm</artifactId>
<version>5.0.3</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>