[jboss-jira] [JBoss JIRA] (WFLY-11353) Classes for newer versions are not loaded from Multi-Release-JARs in WARs

[Daniel Schwering (Jira)]

Daniel Schwering created WFLY-11353:
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             Summary: Classes for newer versions are not loaded from Multi-Release-JARs in WARs
                 Key: WFLY-11353
                 URL: https://issues.jboss.org/browse/WFLY-11353
             Project: WildFly
          Issue Type: Bug
          Components: Class Loading
    Affects Versions: 14.0.0.Final
         Environment: Java 9+
            Reporter: Daniel Schwering
         Attachments: buggywar.src.zip, buggywar.war, multireleaselib-0.0.1-SNAPSHOT.jar, multireleaselib.src.zip

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Since Java 9 there are Multi-Release JARs ([MRJARS|https://openjdk.java.net/jeps/238]) that allow different classes for different Java versions to be included in one JAR file. I was surprised when a Wildfly 14 running on Java 11 executed Java-8-code in a JAR included in a WAR although the JAR was a MRJAR with code for Java 11. That JAR included as a dependency for a regular Java SE project is running different code depending on the running JRE, but when included in a WAR, the Java-11-code seems to be ignored.

Is that expected behavior for a webserver, as Java EE 8 does not explicitly require Java 9 (which introduced MRJARs) but only Java 8?



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