Build with Gradle 5.4.1 fails

Please ensure you have given all the following requested information in your report.

Issue details

> Configure project :tests:gdx-tests-android
WARNING: Configuration 'compile' is obsolete and has been replaced with 'implementation'.
It will be removed at the end of 2018

> Task :extensions:gdx-jnigen:compileJava FAILED
error: Source option 6 is no longer supported. Use 7 or later.
error: Target option 6 is no longer supported. Use 7 or later.

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':extensions:gdx-jnigen:compileJava'.
> Compilation failed; see the compiler error output for details.

Reproduction steps/code

Downloaded https://github.com/libgdx/libgdx/archive/gdx-parent-1.9.10.tar.gz Extract to folder, run Gradle Build from command line Gradle is local installation (version 5.4.1) JDK is Open jdk-12.0.1 (Oracle)

Version of LibGDX and/or relevant dependencies

1.9.10

Stacktrace

None, Compile fails

Please select the affected platforms

None, Compile fails

Additional notes, Changed all sourceCompatibility and targetCompatibility in all gradle files from 1.6 and 1.7 to 1.8 Most of compile goes through but it fails again with following error

> Task :extensions:gdx-bullet:compileJava FAILED
P:\libgdx-gdx-parent-1.9.10\extensions\gdx-bullet\jni\swig-src\collision\com\badlogic\gdx\physics\bullet\collision\Collision.java:148: error: cannot find symbol
  public static void setGContactAddedCallback(SWIGTYPE_p_f_r_btManifoldPoint_p_q_const__btCollisionObjectWrapper_int_int_p_q_const__btCollisionObjectWrapper_int_int__bool value) {
                                              ^
  symbol:   class SWIGTYPE_p_f_r_btManifoldPoint_p_q_const__btCollisionObjectWrapper_int_int_p_q_const__btCollisionObjectWrapper_int_int__bool
  location: class Collision
P:\libgdx-gdx-parent-1.9.10\extensions\gdx-bullet\jni\swig-src\collision\com\badlogic\gdx\physics\bullet\collision\Collision.java:152: error: cannot find symbol
  public static SWIGTYPE_p_f_r_btManifoldPoint_p_q_const__btCollisionObjectWrapper_int_int_p_q_const__btCollisionObjectWrapper_int_int__bool getGContactAddedCallback() {
                ^
  symbol:   class SWIGTYPE_p_f_r_btManifoldPoint_p_q_const__btCollisionObjectWrapper_int_int_p_q_const__btCollisionObjectWrapper_int_int__bool
  location: class Collision
P:\libgdx-gdx-parent-1.9.10\extensions\gdx-bullet\jni\swig-src\dynamics\com\badlogic\gdx\physics\bullet\dynamics\btSimulationIslandManagerMt.java:235: error: cannot find symbol
  public SWIGTYPE_p_f_p_btAlignedObjectArray__p_btSimulationIslandManagerMt__Island___p_btSimulationIslandManagerMt__IslandCallback__void getIslandDispatchFunction() {
         ^
  symbol:   class SWIGTYPE_p_f_p_btAlignedObjectArray__p_btSimulationIslandManagerMt__Island___p_btSimulationIslandManagerMt__IslandCallback__void
  location: class btSimulationIslandManagerMt
P:\libgdx-gdx-parent-1.9.10\extensions\gdx-bullet\jni\swig-src\dynamics\com\badlogic\gdx\physics\bullet\dynamics\btSimulationIslandManagerMt.java:240: error: cannot find symbol
  public void setIslandDispatchFunction(SWIGTYPE_p_f_p_btAlignedObjectArray__p_btSimulationIslandManagerMt__Island___p_btSimulationIslandManagerMt__IslandCallback__void func) {
                                        ^
  symbol:   class SWIGTYPE_p_f_p_btAlignedObjectArray__p_btSimulationIslandManagerMt__Island___p_btSimulationIslandManagerMt__IslandCallback__void
  location: class btSimulationIslandManagerMt
P:\libgdx-gdx-parent-1.9.10\extensions\gdx-bullet\jni\swig-src\collision\com\badlogic\gdx\physics\bullet\collision\Collision.java:149: error: cannot find symbol
    CollisionJNI.gContactAddedCallback_set(SWIGTYPE_p_f_r_btManifoldPoint_p_q_const__btCollisionObjectWrapper_int_int_p_q_const__btCollisionObjectWrapper_int_int__bool.getCPtr(value));
                                           ^
  symbol:   variable SWIGTYPE_p_f_r_btManifoldPoint_p_q_const__btCollisionObjectWrapper_int_int_p_q_const__btCollisionObjectWrapper_int_int__bool
  location: class Collision
P:\libgdx-gdx-parent-1.9.10\extensions\gdx-bullet\jni\swig-src\collision\com\badlogic\gdx\physics\bullet\collision\Collision.java:154: error: cannot find symbol
    return (cPtr == 0) ? null : new SWIGTYPE_p_f_r_btManifoldPoint_p_q_const__btCollisionObjectWrapper_int_int_p_q_const__btCollisionObjectWrapper_int_int__bool(cPtr, false);
                                    ^
  symbol:   class SWIGTYPE_p_f_r_btManifoldPoint_p_q_const__btCollisionObjectWrapper_int_int_p_q_const__btCollisionObjectWrapper_int_int__bool
  location: class Collision
P:\libgdx-gdx-parent-1.9.10\extensions\gdx-bullet\jni\swig-src\dynamics\com\badlogic\gdx\physics\bullet\dynamics\btSimulationIslandManagerMt.java:237: error: cannot find symbol
    return (cPtr == 0) ? null : new SWIGTYPE_p_f_p_btAlignedObjectArray__p_btSimulationIslandManagerMt__Island___p_btSimulationIslandManagerMt__IslandCallback__void(cPtr, false);
                                    ^
  symbol:   class SWIGTYPE_p_f_p_btAlignedObjectArray__p_btSimulationIslandManagerMt__Island___p_btSimulationIslandManagerMt__IslandCallback__void
  location: class btSimulationIslandManagerMt
P:\libgdx-gdx-parent-1.9.10\extensions\gdx-bullet\jni\swig-src\dynamics\com\badlogic\gdx\physics\bullet\dynamics\btSimulationIslandManagerMt.java:241: error: cannot find symbol
    DynamicsJNI.btSimulationIslandManagerMt_setIslandDispatchFunction(swigCPtr, this, SWIGTYPE_p_f_p_btAlignedObjectArray__p_btSimulationIslandManagerMt__Island___p_btSimulationIslandManagerMt__IslandCallback__void.getCPtr(func));
                                                                                      ^
  symbol:   variable SWIGTYPE_p_f_p_btAlignedObjectArray__p_btSimulationIslandManagerMt__Island___p_btSimulationIslandManagerMt__IslandCallback__void
  location: class btSimulationIslandManagerMt
Note: P:\libgdx-gdx-parent-1.9.10\extensions\gdx-bullet\src\com\badlogic\gdx\physics\bullet\BulletBase.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
8 errors

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':extensions:gdx-bullet:compileJava'.
> Compilation failed; see the compiler error output for details.

[SimonIT]

I recommend you to use java 11. With java 11 you don’t have to increase the sourceCompatibility and targetCompatibility

[SimonIT]

Tom-Ski changed the sourceCompatibility and targetCompatibility in https://github.com/libgdx/libgdx/commit/de77fee09ca14d0b2a02672ba93fa6871f1b7e05, so it might work now without changing the jdk