Bug#893346: libxerces2-java FTBFS with openjdk-9

[Adrian Bunk]

Source: libxerces2-java
Version: 2.11.0-8
Severity: serious

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/libxerces2-java.html

...
compile:
     [copy] Copying 23 files to /build/1st/libxerces2-java-2.11.0/build/classes
   [xjavac] Using javac -source 1.4 is no longer supported, switching to 1.6
   [xjavac] Using javac -target 1.4 is no longer supported, switching to 1.6
   [xjavac] Compiling 707 source files to /build/1st/libxerces2-java-2.11.0/build/classes
   [xjavac] Fatal Error: Unable to find package java.lang in classpath or bootclasspath

BUILD FAILED
/build/1st/libxerces2-java-2.11.0/build.xml:313: Compile failed; see the compiler error output for details.

Total time: 52 seconds
dh_auto_build: ant -propertyfile ./debian/ant.properties -Duser.name debian jar sampjar javadocs returned exit code 1
make[1]: *** [debian/rules:9: override_dh_auto_build] Error 2