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java.lang.ClassNotFoundException: org.postgresql.Driver  	at org.apache.tools.ant.AntClassLoader.findClassInComponents(AntClassLoader.java:1365)	at org.apache.tools.ant.AntClassLoader.findClass(AntClassLoader.java:1315)	at org.apache.tools.ant.AntClassLoader.loadClass(AntClassLoader.java:1068)	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:169)	at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:192)	at org.hibernate.connection.DriverManagerConnectionProvider.configure(DriverManagerConnectionProvider.java:84)	at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:143)	at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:84)	at org.hibernate.tool.hbm2ddl.ManagedProviderConnectionHelper.prepare(ManagedProviderConnectionHelper.java:51)	at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:168)	at org.hibernate.tool.ant.Hbm2DDLExporterTask.execute(Hbm2DDLExporterTask.java:42)	at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:186)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)	at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)	at org.apache.tools.ant.Task.perform(Task.java:348)	at org.apache.tools.ant.Target.execute(Target.java:392)	at org.apache.tools.ant.Target.performTasks(Target.java:413)	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)	at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38)	at org.eclipse.ant.internal.launching.remote.EclipseSingleCheckExecutor.executeTargets(EclipseSingleCheckExecutor.java:30)	at org.apache.tools.ant.Project.executeTargets(Project.java:1251)	at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:442)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)	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.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)	at org.apache.tools.ant.Task.perform(Task.java:348)	at org.apache.tools.ant.Target.execute(Target.java:392)	at org.apache.tools.ant.Target.performTasks(Target.java:413)	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)	at org.apache.tools.ant.Project.executeTarget(Project.java:1368)	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)	at org.eclipse.ant.internal.launching.remote.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:32)	at org.apache.tools.ant.Project.executeTargets(Project.java:1251)	at org.eclipse.ant.internal.launching.remote.InternalAntRunner.run(InternalAntRunner.java:424)	at org.eclipse.ant.internal.launching.remote.InternalAntRunner.main(InternalAntRunner.java:138)