JDK7 compilation with javac7 fails with NPE and assertion error with several changes in one file. The log message:
compile:
    [javac] Compiling 2735 source files to /tmp/jprt/P1/B/140356.mg116726/source/build/linux-i586/jaxws/build/classes
    [javac] java.lang.NullPointerException
    [javac] at com.sun.tools.javac.code.Lint$AugmentVisitor.augment(Lint.java:290)
    [javac] at com.sun.tools.javac.code.Lint.augment(Lint.java:82)
    [javac] at com.sun.tools.javac.comp.Attr.attribLazyConstantValue(Attr.java:597)
    [javac] at com.sun.tools.javac.code.Symbol$VarSymbol$1.call(Symbol.java:975)
    [javac] at com.sun.tools.javac.code.Symbol$VarSymbol.getConstValue(Symbol.java:1007)
    [javac] at com.sun.tools.javac.comp.Attr.checkInit(Attr.java:2622)
    [javac] at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:2280)
    [javac] at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1677)
    [javac] at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:431)
    [javac] at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:418)
    [javac] at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:449)
    [javac] at com.sun.tools.javac.comp.Annotate.enterAttributeValue(Annotate.java:203)
    [javac] at com.sun.tools.javac.comp.Annotate.enterAnnotation(Annotate.java:181)
    [javac] at com.sun.tools.javac.comp.MemberEnter.enterAnnotations(MemberEnter.java:778)
    [javac] at com.sun.tools.javac.comp.MemberEnter.access$300(MemberEnter.java:56)
    [javac] at com.sun.tools.javac.comp.MemberEnter$5.enterAnnotation(MemberEnter.java:746)
    [javac] at com.sun.tools.javac.comp.Annotate.flush(Annotate.java:109)
    [javac] at com.sun.tools.javac.comp.Annotate.enterDone(Annotate.java:101)
    [javac] at com.sun.tools.javac.comp.Enter.complete(Enter.java:510)
    [javac] at com.sun.tools.javac.comp.Enter.main(Enter.java:469)
    [javac] at com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:929)
    [javac] at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:824)
    [javac] at com.sun.tools.javac.main.Main.compile(Main.java:417)
    [javac] at com.sun.tools.javac.main.Main.compile(Main.java:331)
    [javac] at com.sun.tools.javac.main.Main.compile(Main.java:322)
    [javac] at com.sun.tools.javac.Main.compile(Main.java:76)
    [javac] at com.sun.tools.javac.Main.main(Main.java:61)
    [javac] An exception has occurred in the compiler (1.7.0-internal_bootstrap). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
    [javac] java.lang.AssertionError: java.lang.NullPointerException
    [javac] at com.sun.tools.javac.code.Symbol$VarSymbol.getConstValue(Symbol.java:1010)
    [javac] at com.sun.tools.javac.comp.Attr.checkInit(Attr.java:2622)
    [javac] at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:2280)
    [javac] at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1677)
    [javac] at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:431)
    [javac] at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:418)
    [javac] at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:449)
    [javac] at com.sun.tools.javac.comp.Annotate.enterAttributeValue(Annotate.java:203)
    [javac] at com.sun.tools.javac.comp.Annotate.enterAnnotation(Annotate.java:181)
    [javac] at com.sun.tools.javac.comp.MemberEnter.enterAnnotations(MemberEnter.java:778)
    [javac] at com.sun.tools.javac.comp.MemberEnter.access$300(MemberEnter.java:56)
    [javac] at com.sun.tools.javac.comp.MemberEnter$5.enterAnnotation(MemberEnter.java:746)
    [javac] at com.sun.tools.javac.comp.Annotate.flush(Annotate.java:109)
    [javac] at com.sun.tools.javac.comp.Annotate.enterDone(Annotate.java:101)
    [javac] at com.sun.tools.javac.comp.Enter.complete(Enter.java:510)
    [javac] at com.sun.tools.javac.comp.Enter.main(Enter.java:469)
    [javac] at com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:929)
    [javac] at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:824)
    [javac] at com.sun.tools.javac.main.Main.compile(Main.java:417)
    [javac] at com.sun.tools.javac.main.Main.compile(Main.java:331)
    [javac] at com.sun.tools.javac.main.Main.compile(Main.java:322)
    [javac] at com.sun.tools.javac.Main.compile(Main.java:76)
    [javac] at com.sun.tools.javac.Main.main(Main.java:61)
    [javac] Caused by: java.lang.NullPointerException
    [javac] at com.sun.tools.javac.code.Lint$AugmentVisitor.augment(Lint.java:290)
    [javac] at com.sun.tools.javac.code.Lint.augment(Lint.java:82)
    [javac] at com.sun.tools.javac.comp.Attr.attribLazyConstantValue(Attr.java:597)
    [javac] at com.sun.tools.javac.code.Symbol$VarSymbol$1.call(Symbol.java:975)
    [javac] at com.sun.tools.javac.code.Symbol$VarSymbol.getConstValue(Symbol.java:1007)
    [javac] ... 22 more

Will also attach failing jaxws zip file which contains the change.