Spring Framework example source code file (NestedExceptionTests.java)

This example Spring Framework source code file (NestedExceptionTests.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Spring Framework tags/keywords

bytearrayoutputstream, bytearrayoutputstream, io, nestedcheckedexception, nestedexceptiontests, nestedruntimeexception, printwriter, printwriter, servlet, servletexception, servletexception, string, string, testcase

The Spring Framework NestedExceptionTests.java source code

/*
 * Copyright 2002-2005 the original author or authors.
 * 
 * Licensed 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
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.core;

import java.io.ByteArrayOutputStream;
import java.io.PrintWriter;

import javax.servlet.ServletException;

import junit.framework.TestCase;

/**
 * @author Rod Johnson
 * @author Juergen Hoeller
 */
public class NestedExceptionTests extends TestCase {

	public void testNestedRuntimeExceptionWithNoRootCause() {
		String mesg = "mesg of mine";
		// Making a class abstract doesn't _really_ prevent instantiation :-)
		NestedRuntimeException nex = new NestedRuntimeException(mesg) {};
		assertNull(nex.getCause());
		assertEquals(nex.getMessage(), mesg);

		// Check printStackTrace
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		PrintWriter pw = new PrintWriter(baos);
		nex.printStackTrace(pw);
		pw.flush();
		String stackTrace = new String(baos.toByteArray());
		assertFalse(stackTrace.indexOf(mesg) == -1);
	}

	public void testNestedRuntimeExceptionWithRootCause() {
		String myMessage = "mesg for this exception";
		String rootCauseMesg = "this is the obscure message of the root cause";
		ServletException rootCause = new ServletException(rootCauseMesg);
		// Making a class abstract doesn't _really_ prevent instantiation :-)
		NestedRuntimeException nex = new NestedRuntimeException(myMessage, rootCause) {};
		assertEquals(nex.getCause(), rootCause);
		assertTrue(nex.getMessage().indexOf(myMessage) != -1);
		assertTrue(nex.getMessage().indexOf(rootCauseMesg) != -1);

		// check PrintStackTrace
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		PrintWriter pw = new PrintWriter(baos);
		nex.printStackTrace(pw);
		pw.flush();
		String stackTrace = new String(baos.toByteArray());
		assertFalse(stackTrace.indexOf(rootCause.getClass().getName()) == -1);
		assertFalse(stackTrace.indexOf(rootCauseMesg) == -1);
	}

	public void testNestedCheckedExceptionWithNoRootCause() {
		String mesg = "mesg of mine";
		// Making a class abstract doesn't _really_ prevent instantiation :-)
		NestedCheckedException nex = new NestedCheckedException(mesg) {};
		assertNull(nex.getCause());
		assertEquals(nex.getMessage(), mesg);
		
		// Check printStackTrace
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		PrintWriter pw = new PrintWriter(baos);
		nex.printStackTrace(pw);
		pw.flush();
		String stackTrace = new String(baos.toByteArray());
		assertFalse(stackTrace.indexOf(mesg) == -1);
	}
	
	public void testNestedCheckedExceptionWithRootCause() {
		String myMessage = "mesg for this exception";
		String rootCauseMesg = "this is the obscure message of the root cause";
		ServletException rootCause = new ServletException(rootCauseMesg);
		// Making a class abstract doesn't _really_ prevent instantiation :-)
		NestedCheckedException nex = new NestedCheckedException(myMessage, rootCause) {};
		assertEquals(nex.getCause(), rootCause);
		assertTrue(nex.getMessage().indexOf(myMessage) != -1);
		assertTrue(nex.getMessage().indexOf(rootCauseMesg) != -1);
		
		// check PrintStackTrace
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		PrintWriter pw = new PrintWriter(baos);
		nex.printStackTrace(pw);
		pw.flush();
		String stackTrace = new String(baos.toByteArray());
		assertFalse(stackTrace.indexOf(rootCause.getClass().getName()) == -1);
		assertFalse(stackTrace.indexOf(rootCauseMesg) == -1);
	}

}