org.hibernate.hql.ast.QuerySyntaxException

Description: org.hibernate.hql.ast.QuerySyntaxException: Tablename is not mapped [SELECT id
FROM Tablename] when trying to run NamedQuery in JPA. 


Reason/Solution: Put simply, you are using the table name instead of the Entity class name mapped in persistence.xml. 


So if table USERS is mapped to entity class User, your query will need User and not USERS. 

Errors occurred during wsimport.

Description: Errors occurred during wsimport.
  [failed to localize] wsimport.ParsingWSDL()
[failed to localize] wsimport.ErrorMessage(A class/interface with the same name "mypackage.MyClass" is already in use. Use a class customization to resolve this conflict.)
[failed to localize]

Reason:This is an error generated by the XJC that comes with JDK 1.6.

Solution: While there are parameters you can pass to the tool from command line etc, the simplest explanation is that there are multiple types of the same name in your WSDL/XSD. Resolve the duplicate names and you will be good to go.

The MyClass is the XSD type you are looking for! HTH!

RAD does not start

Description: RAD does not startup. I came across the problem with RAD 7.0. You get a popup screen showing something like this.

-vmC:\RAD70SDP\jdk\jre\bin\javaw.exe

-vmargs

-Xquickstart

-Xms40m

-Xmx768m

-Xgcpolicy:gencon

-Xscmx96m

-Xshareclasses:singleJVM,keep

-Xnolinenumbers

-XX:MaxPermSize=512M

Reason: Not sure. Might be with initialisation.

Solution: Open the eclipse.ini file located in the RAD installation directory. just delete all the contents of the file. Save the file and try to open RAD again.

WARNING: Keep a backup of the eclipse.ini file. [Just in case my fix fails :D]