Question

用Hibernate查询，在Integer total=(Integer)c.uniqueResult()出现下面的错误,怎么解决啊，是JDK版本问题

java.lang.ClassFormatError: Unknown constant tag 69 in class file org/hibernate/criterion/CriteriaQuery
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1850)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:890)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1354)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1850)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:890)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1354)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at org.hibernate.loader.criteria.CriteriaLoader.<init>(CriteriaLoader.java:58)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1514)
at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:283)
at org.hibernate.impl.CriteriaImpl.uniqueResult(CriteriaImpl.java:305)
at com.auscend.students.dao.StudentDaoImplm.studentPage(StudentDaoImplm.java:76)
at com.auscend.students.service.StudentServiceImpl.studentPage(StudentServiceImpl.java:27)
at com.auscend.students.action.StudentAction.studentPage(StudentAction.java:113)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:274)
at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:194)
at org.apache.struts.actions.MappingDispatchAction.execute(MappingDispatchAction.java:169)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
2011-8-13 22:47:20 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet action threw exception
java.lang.ClassFormatError: org/hibernate/loader/criteria/CriteriaQueryTranslator

Answer 1

http://download.oracle.com/javame/config/cldc/cldc-opt-impl/cldc-hi-2.2/doc/porting/html/appendix1.html

里面又error code，自己查下

Answer 2

看来你使用的是Criteria查询的，类型转换错误。constant 是未知的。是不是hbm.xml文件配置与实际类不符合？检查一下。
最好把你的源代码发一部分看看。