title: Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]
body: <p>I am developing an application with Hibernate and I get an Exception when I connect with database. The exception is:</p>
  
  <pre><code>Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]
  </code></pre>
  
  <p>My mapping file is:</p>
  
  <pre><code>&lt;hibernate-mapping&gt;
  &lt;class name="com.cartif.database.SetPoint" table="SetPoint"&gt;
      &lt;id name="iSetPointId" column="setpointid" type="java.lang.Integer"&gt;
          &lt;generator class="sequence"&gt;
              &lt;param name="sequence"&gt;s_setpoint&lt;/param&gt;
          &lt;/generator&gt;
      &lt;/id&gt;
      &lt;property column="sensorType" generated="never" lazy="false" name="sSensortype" type="java.lang.String"/&gt;
      &lt;property column="value" generated="never" lazy="false" name="dValue" type="java.lang.Double"/&gt;
      &lt;property column="relationship" generated="never" lazy="false" name="sRelation" type="java.lang.String"/&gt;
      &lt;property column="deviceid" generated="never" lazy="false" name="iDeviceId" type="java.lang.Integer"/&gt;
  &lt;/class&gt;
  &lt;/hibernate-mapping&gt;
  </code></pre>
  
  <p>And the class with getters/setters which are not included:</p>
  
  <pre><code>public class SetPoint {
      private int iSetPointId;
      private String sSensorType;
      private double dValue;
      private String sRelationship;
      private int iDeviceId;
  }
  </code></pre>
  
  <p>I have <code>javassist.jar</code> included into classpath. I do not know what is the problem. Someone would help me please.</p>
  
  <p>Thanks!</p>
  
  <hr>
  
  <p>I found when the error is launched. If I include properties in mapping file exception is thrown. If I only declare id of table, the exception is not thrown. What is the possible cause?</p>
  
  <hr>
  
  <p>The complete stacktrace is:</p>
  
  <pre><code>162980 [btpool0-2 - /Gateway/zigbeedriver/app] ERROR org.hibernate.proxy.pojo.BasicLazyInitializer  - Javassist Enhancement failed: com.cartif.database.ApplicationField
  java.lang.RuntimeException: by java.lang.NoClassDefFoundError:   javassist/util/proxy/ProxyObject
  at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:174)
  at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxyFactory(JavassistLazyInitializer.java:162)
  at org.hibernate.proxy.pojo.javassist.JavassistProxyFactory.postInstantiate(JavassistProxyFactory.java:65)
  at org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PojoEntityTuplizer.java:185)
  at org.hibernate.tuple.entity.AbstractEntityTuplizer.&lt;init&gt;(AbstractEntityTuplizer.java:167)
  at org.hibernate.tuple.entity.PojoEntityTuplizer.&lt;init&gt;(PojoEntityTuplizer.java:77)
  at sun.reflect.GeneratedConstructorAccessor12.newInstance(Unknown Source)
  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
  at java.lang.reflect.Constructor.newInstance(Unknown Source)
  at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:105)
  at org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:133)
  at org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.&lt;init&gt;(EntityEntityModeToTuplizerMapping.java:80)
  at org.hibernate.tuple.entity.EntityMetamodel.&lt;init&gt;(EntityMetamodel.java:322)
  at org.hibernate.persister.entity.AbstractEntityPersister.&lt;init&gt;(AbstractEntityPersister.java:485)
  at org.hibernate.persister.entity.SingleTableEntityPersister.&lt;init&gt;(SingleTableEntityPersister.java:133)
  at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:84)
  at org.hibernate.impl.SessionFactoryImpl.&lt;init&gt;(SessionFactoryImpl.java:286)
  at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1845)
  at com.db.manager.DatabaseManager.createSession(DatabaseManager.java:74)
  at com.db.manager.DatabaseManager.loadObject(DatabaseManager.java:95)
  at com.cartif.database.User.loadUser(User.java:53)
  at com.cartif.database.User.checkUser(User.java:57)
  at com.cartif.zigbee.ZigbeeDriverImpl.checkUser(ZigbeeDriverImpl.java:124)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  at java.lang.reflect.Method.invoke(Unknown Source)
  at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
  at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:58)
  at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:62)
  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
  at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
  at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
  at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:56)
  at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:39)
  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
  at org.springframework.osgi.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:59)
  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
  at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
  at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
  at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
  at $Proxy21.checkUser(Unknown Source)
  at main.com.cartif.app.server.AppServiceImpl.getUser(AppServiceImpl.java:39)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  at java.lang.reflect.Method.invoke(Unknown Source)
  at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569)
  at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)
  at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
  at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
  at main.com.cartif.app.server.AppServiceImpl.service(AppServiceImpl.java:33)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
  at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
  at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
  at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
  at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
  at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
  at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
  at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
  at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
  at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
  at org.mortbay.jetty.Server.handle(Server.java:320)
  at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
  at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:842)
  at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:648)
  at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
  at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
  at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
  at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)
  Caused by: javassist.CannotCompileException: by java.lang.NoClassDefFoundError: javassist/util/proxy/ProxyObject
  at javassist.util.proxy.FactoryHelper.toClass(FactoryHelper.java:167)
  at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:170)
  ... 72 more
  Caused by: java.lang.NoClassDefFoundError: javassist/util/proxy/ProxyObject
  at java.lang.ClassLoader.defineClass1(Native Method)
  at java.lang.ClassLoader.defineClassCond(Unknown Source)
  at java.lang.ClassLoader.defineClass(Unknown Source)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  at java.lang.reflect.Method.invoke(Unknown Source)
  at javassist.util.proxy.FactoryHelper.toClass(FactoryHelper.java:159)
  ... 73 more
  Caused by: java.lang.ClassNotFoundException: javassist.util.proxy.ProxyObject
  at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:506)
  at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)
  at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
  at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
  at java.lang.ClassLoader.loadClass(Unknown Source)
  ... 81 more
  163012 [btpool0-2 - /Gateway/zigbeedriver/app] WARN   org.hibernate.tuple.entity.PojoEntityTuplizer  - could not create proxy factory for:com.cartif.database.ApplicationField
  org.hibernate.HibernateException: Javassist Enhancement failed: com.cartif.database.ApplicationField
  at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxyFactory(JavassistLazyInitializer.java:169)
  at org.hibernate.proxy.pojo.javassist.JavassistProxyFactory.postInstantiate(JavassistProxyFactory.java:65)
  at org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PojoEntityTuplizer.java:185)
  at org.hibernate.tuple.entity.AbstractEntityTuplizer.&lt;init&gt;(AbstractEntityTuplizer.java:167)
  at org.hibernate.tuple.entity.PojoEntityTuplizer.&lt;init&gt;(PojoEntityTuplizer.java:77)
  at sun.reflect.GeneratedConstructorAccessor12.newInstance(Unknown Source)
  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
  at java.lang.reflect.Constructor.newInstance(Unknown Source)
  at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:105)
  at org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:133)
  at org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.&lt;init&gt;(EntityEntityModeToTuplizerMapping.java:80)
  at org.hibernate.tuple.entity.EntityMetamodel.&lt;init&gt;(EntityMetamodel.java:322)
  at org.hibernate.persister.entity.AbstractEntityPersister.&lt;init&gt;(AbstractEntityPersister.java:485)
  at org.hibernate.persister.entity.SingleTableEntityPersister.&lt;init&gt;(SingleTableEntityPersister.java:133)
  at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:84)
  at org.hibernate.impl.SessionFactoryImpl.&lt;init&gt;(SessionFactoryImpl.java:286)
  at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1845)
  at com.db.manager.DatabaseManager.createSession(DatabaseManager.java:74)
  at com.db.manager.DatabaseManager.loadObject(DatabaseManager.java:95)
  at com.cartif.database.User.loadUser(User.java:53)
  at com.cartif.database.User.checkUser(User.java:57)
  at com.cartif.zigbee.ZigbeeDriverImpl.checkUser(ZigbeeDriverImpl.java:124)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  at java.lang.reflect.Method.invoke(Unknown Source)
  at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
  at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:58)
  at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:62)
  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
  at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
  at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
  at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:56)
  at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:39)
  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
  at org.springframework.osgi.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:59)
  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
  at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
  at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
  at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
  at $Proxy21.checkUser(Unknown Source)
  at main.com.cartif.app.server.AppServiceImpl.getUser(AppServiceImpl.java:39)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  at java.lang.reflect.Method.invoke(Unknown Source)
  at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569)
  at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)
  at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
  at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
  at main.com.cartif.app.server.AppServiceImpl.service(AppServiceImpl.java:33)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
  at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
  at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
  at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
  at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
  at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
  at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
  at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
  at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
  at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
  at org.mortbay.jetty.Server.handle(Server.java:320)
  at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
  at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:842)
  at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:648)
  at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
  at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
  at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
  at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)
  Caused by: java.lang.RuntimeException: by java.lang.NoClassDefFoundError: javassist/util/proxy/ProxyObject
  at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:174)
  at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxyFactory(JavassistLazyInitializer.java:162)
  ... 71 more
  Caused by: javassist.CannotCompileException: by java.lang.NoClassDefFoundError: javassist/util/proxy/ProxyObject
  at javassist.util.proxy.FactoryHelper.toClass(FactoryHelper.java:167)
  at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:170)
  ... 72 more
  Caused by: java.lang.NoClassDefFoundError: javassist/util/proxy/ProxyObject
  at java.lang.ClassLoader.defineClass1(Native Method)
  at java.lang.ClassLoader.defineClassCond(Unknown Source)
  at java.lang.ClassLoader.defineClass(Unknown Source)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  at java.lang.reflect.Method.invoke(Unknown Source)
  at javassist.util.proxy.FactoryHelper.toClass(FactoryHelper.java:159)
  ... 73 more
  Caused by: java.lang.ClassNotFoundException: javassist.util.proxy.ProxyObject
  at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:506)
  at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)
  at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
  at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
  at java.lang.ClassLoader.loadClass(Unknown Source)
  ... 81 more
  </code></pre>