Hi, I currently working on an project, implementing a dataadpter to connect to our server, fetching data and displaying them inside jasperstudio. The implementation looks pretty much the same as the com.jaspersoft.studio.data.hive plugin. The only difference I see, is that the DataAdapterImpl.xml is inside my plugin. After debugging i found out, that the following line could not found the DataAdapterImpl.xml inside my plugin. mis = JRLoader.getLocationInputStream(mappingFile); Because it could not be found it throws the following exception Caused by: net.sf.jasperreports.engine.JRRuntimeException: org.exolab.castor.mapping.MappingException: Nested error: org.exolab.castor.xml.MarshalExceptionat net.sf.jasperreports.util.CastorUtil.write(CastorUtil.java:378)at net.sf.jasperreports.util.CastorUtil.write(CastorUtil.java:336)at net.sf.jasperreports.util.CastorUtil.write(CastorUtil.java:516)at com.jaspersoft.studio.data.DataAdapterDescriptor.toXml(DataAdapterDescriptor.java:90)at com.jaspersoft.studio.data.DataAdapterManager.cloneDataAdapter(DataAdapterManager.java:185)at com.jaspersoft.studio.data.wizard.DataAdapterWizard.createPageControls(DataAdapterWizard.java:75)at org.eclipse.jface.wizard.WizardDialog.createPageControls(WizardDialog.java:736) Is this a classpath problem? Maybe i have to use an extensionpoint somehow? Thanks for the help