Exception in thread "main" org.hibernate.MappingException: Cannot use identity column key generation with <union-subclass> mapping for: com.varasofttech.pojo.table_per_concrete_class.PermanentEmployee at org.hibernate.persister.entity.UnionSubclassEntityPersister.<init>(UnionSubclassEntityPersister.java:96) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)...
Friday, February 27, 2015
org.hibernate.MappingException: Unknown entity
Problem:This exception will occur mainly because of the following two reasons1. Making the @Entity with the wrong annotationimport org.hibernate.annotations.Entity; @Entitypublic class Employee implements Serializable { ...}solution for this one is changing the package name.import javax.persistence.Entity;2. Missing the @Entity annotationpublic class Employee implements Serializable { ...}solution for this one is adding the @Entity annotation to the class.import javax.persistence.Entity;@Entitypublic class Employee implements Serializable...
Thursday, February 26, 2015
Tomcat Remote debugging from Eclipse
To enable debug on tomcat, set the following line in your catalina.batDEBUG_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=nFrom your eclipse, create a Run Configuration for 'Remote Java Application' on socket 8000 and restart tomc...
Wednesday, February 4, 2015
Hibernate4 Logging Configuration Example
Hibernate 4.0 onwords for logging the information, JBoss Logging library are used. It is similar to SLF4J, Jakarta's Common logging, it is "logging bridge" provides the integration with several logging frameworks (Log4J, SLF4j, JDK Logging). Hibernate people is chosen JBoss Logging because it supports the I18N and support for "Message ids".Step1: Create a Maven projectCreate a maven project using one of your favorite IDE. Here i used Intellij Idea.Step2: Update the Maven DependenciesUpdate pom.xml file to include...
Monday, February 2, 2015
The method getDispatcherType() is undefined for the type HttpServletRequest
An error occurred at line: [42] in the generated java file: [D:\Upgrade\Upgrade_Eclipse_Worlspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\Spring4Hiberante4Integration\org\apache\jsp\WEB_002dINF\pages\employeeList_jsp.java]The method getDispatcherType() is undefined for the type HttpServletRequestSolution:<dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId>...
