Examples of org.apache.commons.lang.exception.NestableException

Package org.apache.commons.lang.exception

Examples of org.apache.commons.lang.exception.NestableException

org.apache.commons.lang.exception.NestableException

The base class of all exceptions which can contain other exceptions. It is intended to ease the debugging by carrying on the information about the exception which was caught and provoked throwing the current exception. Catching and rethrowing may occur multiple times, and provided that all exceptions except the first one are descendants of NestedException, when the exception is finally printed out using any of the printStackTrace() methods, the stack trace will contain the information about all exceptions thrown and caught on the way.

Running the following program

 1 import org.apache.commons.lang.exception.NestableException; 2 3 public class Test { 4     public static void main( String[] args ) { 5         try { 6             a(); 7         } catch(Exception e) { 8             e.printStackTrace(); 9         } 10      } 11 12      public static void a() throws Exception { 13          try { 14              b(); 15          } catch(Exception e) { 16              throw new NestableException("foo", e); 17          } 18      } 19 20      public static void b() throws Exception { 21          try { 22              c(); 23          } catch(Exception e) { 24              throw new NestableException("bar", e); 25          } 26      } 27 28      public static void c() throws Exception { 29          throw new Exception("baz"); 30      } 31 }

Yields the following stack trace:

 org.apache.commons.lang.exception.NestableException: foo at Test.a(Test.java:16) at Test.main(Test.java:6) Caused by: org.apache.commons.lang.exception.NestableException: bar at Test.b(Test.java:24) at Test.a(Test.java:14) ... 1 more Caused by: java.lang.Exception: baz at Test.c(Test.java:29) at Test.b(Test.java:22) ... 2 more

@author Rafal Krzewski @author Daniel Rall @author Kasper Nielsen @author Steven Caswell @since 1.0 @version $Id: NestableException.java 161243 2005-04-14 04:30:28Z ggregory $

        assertEquals(NestableException.class, ex.getThrowables()[2].getClass());
        assertEquals("nested 2", ex.getThrowables()[2].getMessage());
    }
    
    public void testIndexOfThrowable() {
        NotImplementedException ex = new NotImplementedException(new NestableException("nested 1", new NestableException("nested 2")));
        assertEquals(0, ex.indexOfThrowable(NotImplementedException.class));
        assertEquals(1, ex.indexOfThrowable(NestableException.class));
    }

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        assertEquals(0, ex.indexOfThrowable(NotImplementedException.class));
        assertEquals(1, ex.indexOfThrowable(NestableException.class));
    }
    
    public void testIndexOfThrowable_Index() {
        NotImplementedException ex = new NotImplementedException(new NestableException("nested 1", new NestableException("nested 2")));
        assertEquals(1, ex.indexOfThrowable(NestableException.class, 1));
    }

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        NotImplementedException ex = new NotImplementedException(new NestableException("nested 1", new NestableException("nested 2")));
        assertEquals(1, ex.indexOfThrowable(NestableException.class, 1));
    }
    
    public void testPrintStackTrace() {
        NotImplementedException ex = new NotImplementedException(new NestableException("nested 1", new NestableException("nested 2")));
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        PrintStream ps = new PrintStream(baos);
        PrintStream errStream = System.err;
        System.setErr(ps);
        ex.printStackTrace();

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        System.setErr(errStream);
        assertTrue(baos.toString().length() > 0);
    }
    
    public void testPrintStackTrace_Stream() {
        NotImplementedException ex = new NotImplementedException(new NestableException("nested 1", new NestableException("nested 2")));
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        PrintStream ps = new PrintStream(baos);
        ex.printStackTrace(ps);
        assertTrue(baos.toString().length() > 0);
    }

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        ex.printStackTrace(ps);
        assertTrue(baos.toString().length() > 0);
    }
    
    public void testPrintStackTrace_Writer() {
        NotImplementedException ex = new NotImplementedException(new NestableException("nested 1", new NestableException("nested 2")));
        StringWriter stringWriter = new StringWriter();
        PrintWriter writer = new PrintWriter(stringWriter);
        ex.printStackTrace(writer);
        assertTrue(stringWriter.toString().length() > 0);
    }

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        ex.printStackTrace(writer);
        assertTrue(stringWriter.toString().length() > 0);
    }
    
    public void testPrintPartialStackTrace_Writer() {
      NotImplementedException ex = new NotImplementedException(new NestableException("nested 1", new NestableException("nested 2")));
      StringWriter stringWriter = new StringWriter();
      PrintWriter writer = new PrintWriter(stringWriter);
      ex.printPartialStackTrace(writer);
      assertTrue(stringWriter.toString().length() > 0);
  }

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        }
        catch ( Exception e )
        {
            e.printStackTrace();


            throw new NestableException( "Couldn't setCellStyleProperty.", e );
        }
    }

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            assertEquals("nested 2", messages[2]);
        }
    }
    
    public void testGetThrowable() {
        NotImplementedException ex = new NotImplementedException(new NestableException("nested 1", new NestableException("nested 2")));
        
        assertEquals(3, ex.getThrowableCount());
        
        assertEquals(NotImplementedException.class, ex.getThrowable(0).getClass());
        assertEquals("Code is not implemented", ex.getThrowable(0).getMessage());

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        assertEquals(NestableException.class, ex.getThrowables()[2].getClass());
        assertEquals("nested 2", ex.getThrowables()[2].getMessage());
    }
    
    public void testIndexOfThrowable() {
        NotImplementedException ex = new NotImplementedException(new NestableException("nested 1", new NestableException("nested 2")));
        assertEquals(0, ex.indexOfThrowable(NotImplementedException.class));
        assertEquals(1, ex.indexOfThrowable(NestableException.class));
    }

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        assertEquals(0, ex.indexOfThrowable(NotImplementedException.class));
        assertEquals(1, ex.indexOfThrowable(NestableException.class));
    }
    
    public void testIndexOfThrowable_Index() {
        NotImplementedException ex = new NotImplementedException(new NestableException("nested 1", new NestableException("nested 2")));
        assertEquals(1, ex.indexOfThrowable(NestableException.class, 1));
    }

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