I'm sorry for the cross-post, but I don't know exactly who to address this to.
Just to save you time reading all this: the javac in OpenJDK 6 generates jsr instructions, but only if you compile a great many source files in one go. This affects rt.jar. I'm trying to find out why. If you build OpenJDK6 and do this: happy:jdk6 $ javap -c -bootclasspath build/linux-amd64/classes/ -classpath build/linux-amd64/classes/ java.util.concurrent/PriorityBlockingQueue | grep jsr 48: jsr 62 56: jsr 62 17: jsr 28 23: jsr 28 74: jsr 87 ... you'll see lots of jsr instructions. Why is this? It seems that if you compile the .java file this doesn't happen: happy:jdk6 $ ./build/linux-amd64/j2sdk-image/jre/bin/java -Xmx896m -Xms128m -XX:PermSize=32m -XX:MaxPermSize=160m -Xbootclasspath/p:./build/linux-amd64/langtools/dist/bootstrap/lib/javac.jar -jar ./build/linux-amd64/langtools/dist/bootstrap/lib/javac.jar -g -source 1.5 -target 5 -encoding ascii -Xbootclasspath:/local/openjdk/jdk6/build/linux-amd64/classes -sourcepath /local/openjdk/jdk6/build/linux-amd64/gensrc:/local/openjdk/jdk6/jdk/src/solaris/classes:/local/openjdk/jdk6/jdk/src/share/classes -d /tmp /local/openjdk/jdk6/jdk/src/share/classes/java/util/concurrent/PriorityBlockingQueue.java happy:jdk6 $ javap -c -bootclasspath /tmp -classpath /tmp java.util.concurrent/PriorityBlockingQueue | grep jsr No jsr instructions this time. So, I try the compile again, but with the full list of classes in .classes.list: $ $ /local/openjdk/jdk6/build/linux-amd64/j2sdk-image/jre/bin/java -Xmx896m -Xms128m -XX:PermSize=32m -XX:MaxPermSize=160m -Xbootclasspath/p:/local/openjdk/jdk6/build/linux-amd64/langtools/dist/bootstrap/lib/javac.jar -jar /local/openjdk/jdk6/build/linux-amd64/langtools/dist/bootstrap/lib/javac.jar -g -source 1.5 -target 5 -encoding ascii -Xbootclasspath:/local/openjdk/jdk6/build/linux-amd64/classes -sourcepath /local/openjdk/jdk6/build/linux-amd64/gensrc:/local/openjdk/jdk6/jdk/src/solaris/classes:/local/openjdk/jdk6/jdk/src/share/classes -d /tmp @/local/openjdk/jdk6/build/linux-amd64/tmp/java/java.lang/java/.classes.list $ javap -c -bootclasspath /tmp -classpath /tmp java.util.concurrent/PriorityBlockingQueue | grep jsr | head -5 48: jsr 62 56: jsr 62 17: jsr 28 23: jsr 28 74: jsr 87 Lots of jsrs. Now the really weird bit: if I edit classes.list to contain only a small subset of the files and run the command again, $ grep java.util.concurrent /local/openjdk/jdk6/build/linux-amd64/tmp/java/java.lang/java/.classes.list > classes.concurrent $ /local/openjdk/jdk6/build/linux-amd64/j2sdk-image/jre/bin/java -Xmx896m -Xms128m -XX:PermSize=32m -XX:MaxPermSize=160m -Xbootclasspath/p:/local/openjdk/jdk6/build/linux-amd64/langtools/dist/bootstrap/lib/javac.jar -jar /local/openjdk/jdk6/build/linux-amd64/langtools/dist/bootstrap/lib/javac.jar -g -source 1.5 -target 5 -encoding ascii -Xbootclasspath:/local/openjdk/jdk6/build/linux-amd64/classes -sourcepath /local/openjdk/jdk6/build/linux-amd64/gensrc:/local/openjdk/jdk6/jdk/src/solaris/classes:/local/openjdk/jdk6/jdk/src/share/classes -d /tmp @classes.concurrent $ javap -c -bootclasspath /tmp -classpath /tmp java.util.concurrent/PriorityBlockingQueue | grep jsr | head -5 ... no jsr instructions. I realize that OpenJDK 6 is nearing EOL, but this behaviour is so bizarre that I'd appreciate some input! Thanks, Andrew.
