Case

I run a project with JSF 2 / PrimeFaces 5 (BTW: it rocks!) / Spring 4 / Jetty 9 / Java 8:
[java]MultiException java.lang.RuntimeException: Error scanning file SummerBean.class, java.lang.RuntimeException: Error scanning entry …/SummerService.class from jar file:/…/spring-tier-1.0-SNAPSHOT.jar, java.lang.RuntimeException: Error scanning entry …/SummerServiceImpl.class from jar file:/…/spring-tier-1.0-SNAPSHOT.jar
at org.eclipse.jetty.annotations.AnnotationConfiguration.scanForAnnotations(AnnotationConfiguration.java:530)[/java]

Explanation

The error occurs because of a conflict on the JARs of ASM.

Fix

You have to override Jetty’s dependencies to ASM.
In Maven’s POM, amend Jetty plugin to force ASM versions:
[xml]<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>${jetty.version}</version>
<dependencies>
<dependency>
<groupId>org.ow2.asm</groupId>
<artifactId>asm</artifactId>
<version>5.0.2</version>
</dependency>
<dependency>
<groupId>org.ow2.asm</groupId>
<artifactId>asm-commons</artifactId>
<version>5.0.2</version>
</dependency>
</dependencies>
<!– … –>
</plugin>
[/xml]

Then it should work 😉