关于WAS当中FFDC报告error in opening zip file剖析及解决

FFDC Exception:java.util.zip.ZipException SourceId:com.ibm.ws.classloader.ClassLoaderUtils.addDependents ProbeId:238 Reporter:java.lang.Class@7c537c91   java.util.zip.ZipException: error in opening zip file        at java.util.zip.ZipFile.open(Native Method)        at java.util.zip.ZipFile. init (ZipFile.java:114)   
    at com.ibm.ws.classloader.ClassLoaderUtils.addDependents(ClassLoaderUtils.java:143)   
    at com.ibm.ws.classloader.ClassLoaderUtils.addDependentJars(ClassLoaderUtils.java:61)   
    at com.ibm.ws.classloader.ClassLoaderManager.initialize(ClassLoaderManager.java:202)   
    at com.ibm.ws.classloader.ClassLoaderManager. init (ClassLoaderManager.java:166)   
    at com.ibm.ws.runtime.component.DeployedApplicationImpl.start(DeployedApplicationImpl.java:891)   
    at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:740)   
    at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:2092)   
    at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:437)   
    at com.ibm.ws.runtime.component.CompositionUnitImpl.start(CompositionUnitImpl.java:122)   
    at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:380)   
    at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.access$300(CompositionUnitMgrImpl.java:105)   
    at com.ibm.ws.runtime.component.CompositionUnitMgrImpl$CUInitializer.run(CompositionUnitMgrImpl.java:928)   
    at com.ibm.wsspi.runtime.component.WsComponentImpl$_AsynchInitializer.run(WsComponentImpl.java:349)   

FFDC Exception:java.util.zip.ZipException SourceId:com.ibm.ws.classloader.ClassLoaderUtils.addDependents ProbeId:238 Reporter:java.lang.Class@7c537c91

java.util.zip.ZipException: error in opening zip file

 at java.util.zip.ZipFile.open(Native Method)

 at java.util.zip.ZipFile. init (ZipFile.java:114)

 at java.util.jar.JarFile. init (JarFile.java:133)

 at java.util.jar.JarFile. init (JarFile.java:70)

 at com.ibm.ws.classloader.ClassLoaderUtils.addDependents(ClassLoaderUtils.java:96)

 at com.ibm.ws.classloader.ClassLoaderUtils.addDependents(ClassLoaderUtils.java:143)

 at com.ibm.ws.classloader.ClassLoaderUtils.addDependentJars(ClassLoaderUtils.java:61)

 at com.ibm.ws.classloader.ClassGraph. init (ClassGraph.java:115)

 at com.ibm.ws.classloader.ClassLoaderManager.initialize(ClassLoaderManager.java:202)

 at com.ibm.ws.classloader.ClassLoaderManager. init (ClassLoaderManager.java:166)

 at com.ibm.ws.runtime.component.DeployedApplicationImpl.start(DeployedApplicationImpl.java:891)

 at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:740)

 at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:2092)

 at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:437)

 at com.ibm.ws.runtime.component.CompositionUnitImpl.start(CompositionUnitImpl.java:122)

 at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:380)

 at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.access$300(CompositionUnitMgrImpl.java:105)

 at com.ibm.ws.runtime.component.CompositionUnitMgrImpl$CUInitializer.run(CompositionUnitMgrImpl.java:928)

 at com.ibm.wsspi.runtime.component.WsComponentImpl$_AsynchInitializer.run(WsComponentImpl.java:349)

 at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1527)

那到底是哪个文件在打开时发生错误了呢？一头雾水了吧，汗。。。估计你会。。。

分析：
1、通过对文件的排查，确认排除了应用程序中引用jar文件损坏的可能性以及由于jar文件权限设置导致无法读取的可能性

2、打开跟踪日志级别进行剖析

 0000001e ClassLoaderUt    addDependents Entry    /home/xxx/lib/struts/commons-logging.jar     0000001e ClassLoaderUt 3   dependent classpath detected: log4j.jar log4j-core.jar   
 0000001e FfdcProvider  I com.ibm.ws.ffdc.impl.FfdcProvider logIncident FFDC1003I: FFDC Incident emitted on /usr/IBM/WebSphere/AppServer/profiles/XXX/logs/ffdc/memXXX_f3c3750_08.12.23_16.26.42.85048008.txt com.ibm.ws.classloader.ClassLoaderUtils.addDependents 238  
 0000001e ClassLoaderUt 3   WARNING: could not open /home/xxx/lib/struts/log4j.jar : error in opening zip file     0000001e ClassLoaderUt    addDependents Exit    /home/xxx/lib/struts/log4j.jar     0000001e ClassLoaderUt 3   adding /home/xxx/lib/struts/log4j-core.jar     0000001e ClassLoaderUt    addDependents Entry    /home/xxx/lib/struts/log4j-core.jar     0000001e ClassLoaderUt 3   WARNING: could not open /home/xxx/lib/struts/log4j-core.jar : error in opening zip file     0000001e ClassLoaderUt    addDependents Exit    /home/xxx/lib/struts/log4j-core.jar     0000001e ClassLoaderUt    addDependents Exit    /home/xxx/lib/struts/commons-logging.jar    ......     0000001e ClassLoaderUt    addDependents Entry    /home/xxx/lib/struts/struts.jar     0000001e ClassLoaderUt 3   dependent classpath detected:  commons-beanutils.jar commons-collections.jar commons-digester.jar commons-logging.jar commons-validator.jar jakarta-oro.jar struts-legacy.jar   
 0000001e ClassLoaderUt    addDependents Entry    /home/xxx/lib/struts/jakarta-oro.jar     0000001e ClassLoaderUt 3   WARNING: could not open /home/xxx/lib/struts/jakarta-oro.jar : error in opening zip file     0000001e ClassLoaderUt    addDependents Exit    /home/xxx/lib/struts/jakarta-oro.jar     0000001e ClassLoaderUt 3   adding /home/xxx/lib/struts/struts-legacy.jar     0000001e ClassLoaderUt    addDependents Entry    /home/xxx/lib/struts/struts-legacy.jar     0000001e ClassLoaderUt 3   WARNING: could not open /home/xxx/lib/struts/struts-legacy.jar : error in opening zip file     0000001e ClassLoaderUt    addDependents Exit    /home/xxx/lib/struts/struts-legacy.jar     0000001e ClassLoaderUt    addDependents Exit    ......  

 0000001e ClassLoaderUt addDependents Entry

/home/xxx/lib/struts/commons-logging.jar

 0000001e ClassLoaderUt 3 dependent classpath detected: log4j.jar log4j-core.jar

 0000001e ClassLoaderUt 3 adding /home/xxx/lib/struts/log4j.jar

 0000001e ClassLoaderUt addDependents Entry

/home/xxx/lib/struts/log4j.jar

 0000001e FfdcProvider I com.ibm.ws.ffdc.impl.FfdcProvider logIncident FFDC1003I: FFDC Incident emitted on /usr/IBM/WebSphere/AppServer/profiles/XXX/logs/ffdc/memXXX_f3c3750_08.12.23_16.26.42.85048008.txt com.ibm.ws.classloader.ClassLoaderUtils.addDependents 238

 0000001e ClassLoaderUt 3 WARNING: could not open /home/xxx/lib/struts/log4j.jar : error in opening zip file

 0000001e ClassLoaderUt addDependents Exit

/home/xxx/lib/struts/log4j.jar

 0000001e ClassLoaderUt 3 adding /home/xxx/lib/struts/log4j-core.jar

 0000001e ClassLoaderUt addDependents Entry

/home/xxx/lib/struts/log4j-core.jar

 0000001e ClassLoaderUt 3 WARNING: could not open /home/xxx/lib/struts/log4j-core.jar : error in opening zip file

 0000001e ClassLoaderUt addDependents Exit

/home/xxx/lib/struts/log4j-core.jar

 0000001e ClassLoaderUt addDependents Exit

/home/xxx/lib/struts/commons-logging.jar

......

 0000001e ClassLoaderUt addDependents Entry

/home/xxx/lib/struts/struts.jar

 0000001e ClassLoaderUt 3 dependent classpath detected: commons-beanutils.jar commons-collections.jar commons-digester.jar commons-logging.jar commons-validator.jar jakarta-oro.jar struts-legacy.jar

 0000001e ClassLoaderUt 3 adding /home/xxx/lib/struts/jakarta-oro.jar

 0000001e ClassLoaderUt addDependents Entry

/home/xxx/lib/struts/jakarta-oro.jar

 0000001e ClassLoaderUt 3 WARNING: could not open /home/xxx/lib/struts/jakarta-oro.jar : error in opening zip file

 0000001e ClassLoaderUt addDependents Exit

/home/xxx/lib/struts/jakarta-oro.jar

 0000001e ClassLoaderUt 3 adding /home/xxx/lib/struts/struts-legacy.jar

 0000001e ClassLoaderUt addDependents Entry

/home/xxx/lib/struts/struts-legacy.jar

 0000001e ClassLoaderUt 3 WARNING: could not open /home/xxx/lib/struts/struts-legacy.jar : error in opening zip file

 0000001e ClassLoaderUt addDependents Exit

/home/xxx/lib/struts/struts-legacy.jar

 0000001e ClassLoaderUt addDependents Exit

......

继续分析：
首先，可以确认的是WARNING所报的是正确的，因为可以通过确认所依赖的log4j.jar log4j-core.jar jakarta-oro.jar struts-legacy.jar之类的文件不存在。
其次，这些不存在的包是由谁依赖并需要加载的，通过日志的层次关系可以知道，commons-logging.jar需要log4j.jar log4j-core.jar，struts.jar需要jakarta-oro.jar struts-legacy.jar
这样唯一的可能就是各自的jar包中META-INF/MANIFEST.MF里声明了这些jar的依赖关系了。

打开commons-logging.jar，发现其中的META-INF/MANIFEST.MF里包含了
Class-Path: log4j.jar log4j-core.jar

打开struts.jar，发现其中的META-INF/MANIFEST.MF里包含了
Class-Path:  commons-beanutils.jar commons-collections.jar commons-dig
ester.jar commons-logging.jar commons-validator.jar jakarta-oro.jar s
truts-legacy.jar

于是真相大白了，解决的办法要么增加相应版本所依赖的jar包，要么就是简单地删除Class-Path，根据应用程序的需要进行确认并使用之，[color=red]建议用前者进行解决。要么就升级这些组件包。[/color]

代码解读

dependents = attrs.getValue(java.util.jar.Attributes.Name.CLASS_PATH);// 获取依赖包路径   
    String nextDependentFullPath = (new StringBuilder()).append(prefix).append(nextDependent).   
    Manager.Ffdc.log(ze, ClassLoaderUtils.class, "com.ibm.ws.classloader.ClassLoaderUtils.addDependents", "238" + jarFileName);   
        Tr.debug(tc, (new StringBuilder()).append("WARNING: could not open ").append(jarFileName).append(" : ").append(ze.getLocalizedMessage()).toString());    catch(IOException ioe)        Manager.Ffdc.log(ioe, ClassLoaderUtils.class, "com.ibm.ws.classloader.ClassLoaderUtils.addDependents", "246");   
        Tr.debug(tc, (new StringBuilder()).append("WARNING: I/O exception ").append(jarFileName).append(" : ").append(ioe.getLocalizedMessage()).toString());   
ArrayList newPaths = new ArrayList(Arrays.asList(paths)); for(int i = 0; i paths.length; i++) if(paths[i].toLowerCase().endsWith(".jar")) addDependents(paths[i], newPaths); String result[] = new String[newPaths.size()]; result = (String[])(String[])newPaths.toArray(result); return result; private static void addDependents(String jarFileName, List classpath) // ...省略。。。 jar = new JarFile(jarFileName);// 错误在这一行 manifest = jar.getManifest(); attrs = manifest.getMainAttributes(); dependents = attrs.getValue(java.util.jar.Attributes.Name.CLASS_PATH);// 获取依赖包路径 StringTokenizer tokens = new StringTokenizer(dependents, " "); if(!tokens.hasMoreTokens()) break; String nextDependent = tokens.nextToken(); String nextDependentFullPath = (new StringBuilder()).append(prefix).append(nextDependent). if(PathUtils.listAddNoDup(classpath, nextDependentFullPath)) addDependents(nextDependentFullPath, classpath); // 迭代加载之 } while(true); // ...省略。。。 在catch代码块中 catch(ZipException ze) Manager.Ffdc.log(ze, ClassLoaderUtils.class, "com.ibm.ws.classloader.ClassLoaderUtils.addDependents", "238" + jarFileName); if(debugEnabled) Tr.debug(tc, (new StringBuilder()).append("WARNING: could not open ").append(jarFileName).append(" : ").append(ze.getLocalizedMessage()).toString()); catch(IOException ioe) Manager.Ffdc.log(ioe, ClassLoaderUtils.class, "com.ibm.ws.classloader.ClassLoaderUtils.addDependents", "246"); if(debugEnabled) Tr.debug(tc, (new StringBuilder()).append("WARNING: I/O exception ").append(jarFileName).append(" : ").append(ioe.getLocalizedMessage()).toString());

不厚道，在Manager.Ffdc.log里把jarFileName也打印出来，就更容易知道是什么问题了。
可见打印出有意义的信息对于分析问题是多少的重要。。。

附带信息：将commons-logging.jar与struts.jar与Spring 2.5.5发布所带的包进行对比分析，发现Spring带的commons-logging.jar包没有带有Class-Path这个条目。

Extension-Name: org.apache.commons.logging    Specification-Vendor: Apache Software Foundation    Specification-Version: 1.0   Implementation-Vendor: Apache Software Foundation    Implementation-Version: 1.0.3   Class-Path: log4j.jar log4j-core.jar  
Extension-Name: org.apache.commons.logging Specification-Vendor: Apache Software Foundation Specification-Version: 1.0 Implementation-Vendor: Apache Software Foundation Implementation-Version: 1.0.3 Class-Path: log4j.jar log4j-core.jar

对比

Implementation-Title: Commons Logging    Implementation-Vendor: Apache Software Foundation    Implementation-Vendor-Id: org.apache    Implementation-Version: 1.1.1   Specification-Title: Commons Logging    Specification-Vendor: Apache Software Foundation    Specification-Version: 1.0  
Specification-Title: Struts Framework    Specification-Vendor: Apache Software Foundation    Specification-Version: 1.1   Implementation-Title: Struts Framework    Implementation-Vendor: Apache Software Foundation    Implementation-Vendor-Id: org.apache    Implementation-Version: 1.1   Class-Path:  commons-beanutils.jar commons-collections.jar commons-dig     ester.jar commons-logging.jar commons-validator.jar jakarta-oro.jar s     truts-legacy.jar  
Implementation-Title: Struts Framework Implementation-Vendor: Apache Software Foundation Implementation-Vendor-Id: org.apache Implementation-Version: 1.1 Class-Path: commons-beanutils.jar commons-collections.jar commons-dig ester.jar commons-logging.jar commons-validator.jar jakarta-oro.jar s truts-legacy.jar

对比

Specification-Title: Struts Framework    Specification-Vendor: The Apache Software Foundation    Specification-Version: 1.2.9   Implementation-Title: Struts Framework    Implementation-Vendor: The Apache Software Foundation    Implementation-Vendor-Id: org.apache    Implementation-Version: 1.2.9   Class-Path:  commons-beanutils.jar commons-digester.jar commons-fileup     load.jar commons-logging.jar commons-validator.jar jakarta-oro.jar  
Specification-Title: Struts Framework Specification-Vendor: The Apache Software Foundation Specification-Version: 1.2.9 Implementation-Title: Struts Framework Implementation-Vendor: The Apache Software Foundation Implementation-Vendor-Id: org.apache Implementation-Version: 1.2.9 Class-Path: commons-beanutils.jar commons-digester.jar commons-fileup load.jar commons-logging.jar commons-validator.jar jakarta-oro.jar

也要注意实现的版本问题是不同的