Running ant with jdk7 or openjdk7.
My ant script does something like:

 <unzip src="${drop.bundle}" dest="${drop.dir}"/>

I'm getting this exception:

BUILD FAILED
java.lang.IllegalArgumentException: invalid entry crc-32
        at java.util.zip.ZipEntry.setCrc(ZipEntry.java:186)
        at org.apache.tools.zip.ZipFile.populateFromCentralDirectory(ZipFile.java:300)
        at org.apache.tools.zip.ZipFile.<init>(ZipFile.java:152)
        at org.apache.tools.ant.taskdefs.Expand.expandFile(Expand.java:137)
        at org.apache.tools.ant.taskdefs.Expand.execute(Expand.java:107)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:623)
        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
        at org.apache.tools.ant.Task.perform(Task.java:348)
        at org.apache.tools.ant.Target.execute(Target.java:357)
        at org.apache.tools.ant.Target.performTasks(Target.java:385)
        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
        at org.apache.tools.ant.Main.runBuild(Main.java:758)
        at org.apache.tools.ant.Main.startAnt(Main.java:217)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)

This was happening on Solaris 10 X86, jdk7 java and ant 1.7.1 in PATH, sample build.xml file is:

With jdk6:

bonsai<1> ant
Buildfile: build.xml

all:
     [copy] Copying 1 file to /home/ohair
    [mkdir] Created dir: /home/ohair/dir
    [unzip] Expanding: /home/ohair/xyz.zip into /home/ohair/dir

BUILD SUCCESSFUL
Total time: 23 seconds

With jdk7:

bonsai<2>  ( set path = ( /opt/java/jdk1.7.0/bin ${path} ) ; ant )
Buildfile: build.xml

all:
   [delete] Deleting: /home/ohair/xyz.zip
     [copy] Copying 1 file to /home/ohair
   [delete] Deleting directory /home/ohair/dir
    [mkdir] Created dir: /home/ohair/dir
    [unzip] Expanding: /home/ohair/xyz.zip into /home/ohair/dir

BUILD FAILED
 (exception from above)

bonsai<4> cat build.xml
<?xml version="1.0"?>
<project name="xyz" default="all" basedir=".">
    <target name="all">
       <delete file="xyz.zip"/>
       <copy file="/java/devtools/share/jaxp/jdk7-jaxp-m5.zip" 
              tofile="xyz.zip"/>
       <delete dir="dir"/>
       <mkdir dir="dir"/>
       <unzip src="xyz.zip" dest="dir"/>
    </target>
</project>
###@###.### supplied a smaller test case (modified here to count loops):

public class Foo {

    private static final long BYTE_3_MASK = 0xFF000000L;
    private static final int BYTE_3_SHIFT = 24;

    public static void main(String[] args) {
        java.util.Random r = new java.util.Random();
        byte[] bb = new byte[1];
        long nLoops = 0;

	while(true) {
            nLoops++;
            r.nextBytes(bb);

            long l = (bb[0] << BYTE_3_SHIFT) & BYTE_3_MASK;

	    if (bb[0] < 0)
                System.out.printf("  [toLong]: %x -> %x%n",
				  bb[0] & 0xff, l);

            if ((l & 0xf00000000L) != 0) {
                System.out.printf(nLoops + " Masking failed!%n");
                break;
	    }
        }
    }
}

The test case will run for many minutes on my Solaris-x64 desktop
if I use "-Xint" or "-client"

If I run with my local copy of JDK7 b67 and "-server", I get a failure
at about 14000 iterations, right after Foo:main is compiled:

% /opt/java/jdk1.7.0-b67/fastdebug/bin/java -server \
   -showversion -ea -esa -Xbatch -XX:+PrintCompilation Foo

    [... output trimmed...]

  [toLong]: d4 -> d4000000
  [toLong]: df -> df000000
  [toLong]: be -> be000000
  1%  b   Foo::main @ 14 (124 bytes)
  [toLong]: a7 -> ffffffffa7000000
  1%  made not entrant  (2)  Foo::main @ 14 (124 bytes)
14564 Masking failed!



If I add one more flag:  -XX:CompileOnly=Foo::main

/opt/java/jdk1.7.0-b67/fastdebug/bin/java -server \
   -showversion -ea -esa -Xbatch -XX:+PrintCompilation \
   -XX:CompileOnly=Foo::main Foo

I still get a failure:

  [toLong]: e8 -> e8000000
  [toLong]: f6 -> f6000000
  [toLong]: cc -> cc000000
  [toLong]: 9c -> 9c000000
  1%  b   Foo::main @ 14 (124 bytes)
  [toLong]: e4 -> ffffffffe4000000
  1%  made not entrant  (2)  Foo::main @ 14 (124 bytes)
14564 Masking failed!