jniwrap fails to build with Java 10

[sebastic]

The jniwrap bindings fail to build with OpenJDK 10:

dh_auto_build -Sant -Djniwrap -- do_javah jar_it do_make_help
        cd jniwrap && ant -Duser.name debian do_javah jar_it do_make_help
Buildfile: /build/proj-5.0.1/jniwrap/build.xml

start:
     [echo] Creating folder structure...
    [mkdir] Created dir: /build/proj-5.0.1/jniwrap/classes
    [mkdir] Created dir: /build/proj-5.0.1/jniwrap/libs

do_javac:
     [echo] Compiling the java code...
    [javac] Using javac -source 1.5 is no longer supported, switching to 1.7
    [javac] Using javac -target 1.5 is no longer supported, switching to 1.7
    [javac] anomalous package-info.java path: package-info.java
    [javac] Compiling 3 source files to /build/proj-5.0.1/jniwrap/classes
    [javac] warning: [options] bootstrap class path not set in conjunction with -source 7
    [javac] Note: /build/proj-5.0.1/jniwrap/org/proj4/PJ.java uses or overrides a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] 1 warning

do_javah:
     [echo] Creating jni headers...

BUILD FAILED
/build/proj-5.0.1/jniwrap/build.xml:46: javah does not exist under Java 10 and higher, use the javac task with nativeHeaderDir instead

Total time: 2 seconds
dh_auto_build: cd jniwrap && ant -Duser.name debian do_javah jar_it do_make_help returned exit code 1

CC: @desruisseaux

[desruisseaux]

I presume that you are using the latest stable release? If yes, this issue should already be fixed on master, with the following change: the do_javah jar_it do_make_help Ant targets are replaced by javadoc (as a replacement of do_make_help; the other targets are now implicit).

If there is a need to preserve compatibility with current Ant targets, will could map:

• do_javah to a no-operation (as the error message said, javah is no longer needed and does not exist anymore in JDK 10).
• jar_it to a no-operation (this target is now performed by the default target)
• do_make_help to javadoc.

[desruisseaux]

This issue depends on #903

[sebastic]

This is with PROJ 5.0.1. It doesn't have the restructured build.xml yet, with the extended compile target.

[desruisseaux]

Is there a wish to publish a PROJ 5.0.2 with only a fix for JDK10 without the other build.xml changes, or do the project wait for the next release created from master?

[sebastic]

PROJ 5.1.0 is scheduled for next month, that should be good enough. In the mean time I've included the jniwrap changes from the master branch as a patch in the Debian package.

[sebastic]

With the jniwrap changes from master PROJ 5.0.1 builds successfully with openjdk-10.

[desruisseaux]

Thanks for the information.