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 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.olingo.odata2.jpa.processor.api.exception;

import org.apache.olingo.odata2.api.ep.EntityProvider;
import org.apache.olingo.odata2.api.exception.ODataApplicationException;
import org.apache.olingo.odata2.api.processor.ODataErrorCallback;
import org.apache.olingo.odata2.api.processor.ODataErrorContext;
import org.apache.olingo.odata2.api.processor.ODataResponse;

public class ODataJPAErrorCallback implements ODataErrorCallback {

  @Override
  public ODataResponse handleError(final ODataErrorContext context) throws ODataApplicationException {

    final String SEPARATOR = " : ";

    Throwable t = context.getException();
    if (t instanceof ODataJPAException) {
      StringBuilder errorBuilder = new StringBuilder();
      errorBuilder.append(t.getCause().getClass().toString());
      errorBuilder.append(SEPARATOR);
      errorBuilder.append(t.getCause().getMessage());
      context.setInnerError(errorBuilder.toString());
    }
    return EntityProvider.writeErrorDocument(context);
  }

}

@@ -1671,16 +1671,40 @@
 xception
+ && t.getCause() != null
 ) %7B%0D%0A   

Fix Null Pointer Exception in JPA Error Callback