Bug 839997

Description of problem:
Eclipse has code incompatible with Java 1.4 (for example generics, which were added in 1.5), but produces classes in 1.4 format.

Format 1.4 doesn't have official support for generics, but some compilers (OpenJDK <= 6, ECJ) support generics in format 1.4. Eclipse upstream is abusing this fact and generating format 1.4 classes for "better backwards compatibility".

Since OpenJDK 7, support for generics in class format 1.4 was dropped. See:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7078419
Oracle closed this bug as "Not a Defect", so it will never be fixed.

As a result programs that use Eclipse libraries that have generics cannot be compiled using OpenJDK compiler (ECJ works fine in this case as it still supports generics in 1.4).

This is an important problem because it causes other Fedora packages fail to build from source. Instead of fixing "n" other packages to build with ECJ it is better to fix Eclipse to generate classes in format >= 1.5.

Version-Release number of selected component (if applicable):
eclipse-rcp-4.2.0-0.22.I201205031800.fc17.x86_64

Steps to Reproduce:
I have prepared a reproducer:

$ cat Hello.java
abstract class Hello implements org.osgi.framework.ServiceReference<Hello> {}

$ javac -classpath `build-classpath ../../../usr/lib64/eclipse/plugins` Hello.java
Hello.java:1: error: type ServiceReference does not take parameters
abstract class Hello implements org.osgi.framework.ServiceReference<Hello> {}
                                                                   ^
1 error

$ echo $?
1

$ ecj -classpath `build-classpath ../../../usr/lib64/eclipse/plugins` Hello.java

$ echo $?
0

Actual results:
OpenJDK fails to compile the program.

Expected results:
OpenJDK compiler is able to compile the program successfully.