Bug#893295: libxalan2-java FTBFS with openjdk-9

[Adrian Bunk]

Source: libxalan2-java
Version: 2.7.2-1
Severity: serious

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/libxalan2-java.html

...
serializer.compile:
     [echo] Compiling the Serializer
    [javac] /build/1st/libxalan2-java-2.7.2/build.xml:1713: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
    [javac] Using javac -source 1.3 is no longer supported, switching to 1.6
    [javac] Using javac -target 1.3 is no longer supported, switching to 1.6
    [javac] Compiling 83 source files to /build/1st/libxalan2-java-2.7.2/build/serializer
    [javac] warning: [options] source value 1.6 is obsolete and will be removed in a future release
    [javac] warning: [options] target value 1.6 is obsolete and will be removed in a future release
    [javac] warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
    [javac] 3 warnings
    [javac] Fatal Error: Unable to find package java.lang in classpath or bootclasspath

BUILD FAILED
/build/1st/libxalan2-java-2.7.2/build.xml:1713: Compile failed; see the compiler error output for details.

Total time: 16 seconds
dh_auto_build: ant -propertyfile ./debian/ant.properties -Duser.name debian jar xsltc.unbundledjar javadocs docs returned exit code 1
make[1]: *** [debian/rules:9: override_dh_auto_build] Error 2