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java.util.zip.ZipException: error in opening zip file	at java.util.zip.ZipFile.open(Native Method)	at java.util.zip.ZipFile.(ZipFile.java:219)	at java.util.zip.ZipFile.(ZipFile.java:149)	at java.util.jar.JarFile.(JarFile.java:166)	at java.util.jar.JarFile.(JarFile.java:130)	at org.apache.tools.ant.AntClassLoader.getResourceURL(AntClassLoader.java:1006)	at org.apache.tools.ant.AntClassLoader$ResourceEnumeration.findNextResource(AntClassLoader.java:149)	at org.apache.tools.ant.AntClassLoader$ResourceEnumeration.(AntClassLoader.java:110)	at org.apache.tools.ant.AntClassLoader.findResources(AntClassLoader.java:953)	at org.apache.tools.ant.AntClassLoader.getNamedResources(AntClassLoader.java:922)	at org.apache.tools.ant.loader.AntClassLoader5.getResources(AntClassLoader5.java:56)	at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.checkForkedPath(JUnitTask.java:1177)	at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.executeAsForked(JUnitTask.java:1057)	at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.execute(JUnitTask.java:851)	at org.apache.tools.ant.taskdefs.optional.junit.JUnitTask.execute(JUnitTask.java:816)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)