class "org.apache.commons.collections.FastHashMap"'s signer information does not match signer inform
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net.sf.json.JSONException: java.lang.SecurityException: class "org.apache.commons.collections.FastHashMap"'s signer information does not match signer information of other classes in the same packageat net.sf.json.JSONObject._fromBean(JSONObject.java:987)at net.sf.json.JSONObject.fromObject(JSONObject.java:168)at net.sf.json.JSONObject.fromObject(JSONObject.java:130)at inc.tech.weixin.test.WeixinTest.main(WeixinTest.java:17)Caused by: java.lang.SecurityException: class "org.apache.commons.collections.FastHashMap"'s signer information does not match signer information of other classes in the same packageat java.lang.ClassLoader.checkCerts(Unknown Source)at java.lang.ClassLoader.preDefineClass(Unknown Source)at java.lang.ClassLoader.defineClass(Unknown Source)at java.security.SecureClassLoader.defineClass(Unknown Source)at java.net.URLClassLoader.defineClass(Unknown Source)at java.net.URLClassLoader.access$000(Unknown Source)at java.net.URLClassLoader$1.run(Unknown Source)at java.security.AccessController.doPrivileged(Native Method)at java.net.URLClassLoader.findClass(Unknown Source)at java.lang.ClassLoader.loadClass(Unknown Source)at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)at java.lang.ClassLoader.loadClass(Unknown Source)at java.lang.ClassLoader.loadClassInternal(Unknown Source)at org.apache.commons.beanutils.ConvertUtilsBean.<init>(ConvertUtilsBean.java:125)at org.apache.commons.beanutils.BeanUtilsBean.<init>(BeanUtilsBean.java:110)at org.apache.commons.beanutils.BeanUtilsBean$1.initialValue(BeanUtilsBean.java:68)at org.apache.commons.beanutils.ContextClassLoaderLocal.get(ContextClassLoaderLocal.java:91)at org.apache.commons.beanutils.BeanUtilsBean.getInstance(BeanUtilsBean.java:78)at org.apache.commons.beanutils.PropertyUtilsBean.getInstance(PropertyUtilsBean.java:101)at org.apache.commons.beanutils.PropertyUtils.getPropertyDescriptors(PropertyUtils.java:342)at net.sf.json.JSONObject._fromBean(JSONObject.java:880)... 3 more
在开发项目时,要用到json-lib-2.3的jar包,及其依赖包。在引入项目后,发现包冲突了。原因是新引入的commons-beautils-1.7.0.jar 与struts1.2版本里的commons-beautils.jar里的org.apache.commons.collections.FastHashMap版本不一致的问题。应该是程序import时,不是引用同一个导致的。
解决办法:
1、将struts里的commons-beautils.jar删除
2、或者 在build path,把需要用的commons-beautifls-1.7.0.jar包的 顺序放到struts包的前面,两者皆可。
至于两种的办法的优劣,暂时还没有体会。
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