hibernate空格导致的错误！

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hibernate空格导致的错误！

分类：javaEE

hibernate

数据库中已经有两条记录,这是为了测试数据用的。

下面是我对hibernate中查询进行的测试….

package cn.lwk.dao;import java.util.List;import org.hibernate.classic.Session;import cn.itcast.utils.HibernateUtils;public class EntityDao extends HibernateUtils{public <T> List<T> find(Class<T> t){Session session = sessionFactory.openSession(); List userList = session.createQuery("from"+t.getName()).list(); session.close(); return userList;}}下面是测试数据

package cn.lwk.test;import static org.junit.Assert.*;import java.util.List;import org.junit.Test;import cn.lwk.dao.EntityDao;import cn.lwk.domain.User;public class EntityDaoTest {@Testpublic void testFind() {EntityDao entityDao=new EntityDao();List<User> users = entityDao.find(User.class);System.out.println(users.size());}}但是运行结果却出乎意料….java.lang.IllegalArgumentException: node to traverse cannot be null!at org.hibernate.hql.ast.util.NodeTraverser.traverseDepthFirst(NodeTraverser.java:63)at org.hibernate.hql.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:280)at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:182)at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:101)at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:80)at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:98)at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:156)at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:135)at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1760)at cn.lwk.dao.EntityDao.find(EntityDao.java:12)at cn.lwk.test.EntityDaoTest.testFind(EntityDaoTest.java:17)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:606)at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)at org.junit.runners.ParentRunner.run(ParentRunner.java:236)at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)原因：

爬上那座山，听最圣洁的经。

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