Java 15 support

Please add JDK 15 support. Version 4.2.3 currently doesn’t support it, for example:

java.lang.IllegalArgumentException: Unsupported class file major version 59
	at com.google.inject.internal.asm.$ClassReader.<init>(ClassReader.java:195)
	at com.google.inject.internal.asm.$ClassReader.<init>(ClassReader.java:176)
	at com.google.inject.internal.asm.$ClassReader.<init>(ClassReader.java:162)
	at com.google.inject.internal.asm.$ClassReader.<init>(ClassReader.java:283)
	at com.google.inject.internal.util.LineNumbers.<init>(LineNumbers.java:69)
	at com.google.inject.internal.util.StackTraceElements$1.load(StackTraceElements.java:49)
	at com.google.inject.internal.util.StackTraceElements$1.load(StackTraceElements.java:45)
	at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3529)
	at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2278)
	at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2155)
	at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2045)
	... 52 common frames omitted

[Ganesh-Bhargav-CH]

Error: java.lang.IllegalArgumentException: Unsupported class file major version 59

Explanation: Class file Major version 59 corresponds to Java 15. You are using Java 15 (and compiling your code for it so the generated class files are only valid for Java 15 and newer).

The easy fix is to reconfigure your build to compile for Java 14 or earlier depending on what version of Java you need to use.

You can set the version of compiler at compile time. And compile your java code into old versions of java.

From Oracle article : http://docs.oracle.com/javase/1.5.0/docs/tooldocs/windows/javac.html

Cross-Compilation Example

Here we use javac to compile code that will run on a 1.4 VM.

Command:

javac -target 1.4 -bootclasspath jdk1.4.2/lib/classes.zip \
             -extdirs "" OldCode.java

You might also need following parameter to set denote the version of your code.

-source release -Specifies the version of source code accepted.

This should support Apps developed with Java version 15 and newer and not able to run guice.

Hope this helps resolve the issue.

[markmarch]

We’ve just released 5.0.0 beta, with Java 15 support, please test it with your project and report bugs.

See https://github.com/google/guice/wiki/Guice500