java.lang.ArithmeticException: / by zero
 at greenhouse.ExceptionTest.testException(ExceptionTest.java:16)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
 at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
 at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
 at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
 at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
 at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
 at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

java.lang.NullPointerException
 at greenhouse.ExceptionTest.testException(ExceptionTest.java:16)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
 at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
 at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
 at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
 at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
 at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
 at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

package com.green.monitor.common.exception;
import java.text.MessageFormat;
/**
 * 自定義異常類
 */
public class AppException extends RuntimeException {
 private boolean isSuccess = false;
 private String key;
 private String info;
 public AppException(String key) {
 super(key);
 this.key = key;
 this.info = key;
 }
 public AppException(String key, String message) {
 super(MessageFormat.format("{0}[{1}]", key, message));
 this.key = key;
 this.info = message;
 }
 public AppException(String message, String key, String info) {
 super(message);
 this.key = key;
 this.info = info;
 }
 public boolean isSuccess() {
 return isSuccess;
 }
 public String getKey() {
 return key;
 }
 public void setKey(String key) {
 this.key = key;
 }
 public String getInfo() {
 return info;
 }
 public void setInfo(String info) {
 this.info = info;
 }
 @Override
 public Throwable fillInStackTrace() {
 return this;
 }
 @Override
 public String toString() {
 return MessageFormat.format("{0}[{1}]",this.key,this.info);
 }
}

public class RuntimeException extends Exception {
 static final long serialVersionUID = -7034897190745766939L;
 /** Constructs a new runtime exception with <code>null</code> as its
 * detail message. The cause is not initialized, and may subsequently be
 * initialized by a call to {@link #initCause}.
 */
 public RuntimeException() {
 super();
 }
 /** Constructs a new runtime exception with the specified detail message.
 * The cause is not initialized, and may subsequently be initialized by a
 * call to {@link #initCause}.
 *
 * @param message the detail message. The detail message is saved for 
 *  later retrieval by the {@link #getMessage()} method.
 */
 public RuntimeException(String message) {
 super(message);
 }
 /**
 * Constructs a new runtime exception with the specified detail message and
 * cause. <p>Note that the detail message associated with
 * <code>cause</code> is <i>not</i> automatically incorporated in
 * this runtime exception's detail message.
 *
 * @param message the detail message (which is saved for later retrieval
 *  by the {@link #getMessage()} method).
 * @param cause the cause (which is saved for later retrieval by the
 *  {@link #getCause()} method). (A <tt>null</tt> value is
 *  permitted, and indicates that the cause is nonexistent or
 *  unknown.)
 * @since 1.4
 */
 public RuntimeException(String message, Throwable cause) {
 super(message, cause);
 }
 /** Constructs a new runtime exception with the specified cause and a
 * detail message of <tt>(cause==null ? null : cause.toString())</tt>
 * (which typically contains the class and detail message of
 * <tt>cause</tt>). This constructor is useful for runtime exceptions
 * that are little more than wrappers for other throwables.
 *
 * @param cause the cause (which is saved for later retrieval by the
 *  {@link #getCause()} method). (A <tt>null</tt> value is
 *  permitted, and indicates that the cause is nonexistent or
 *  unknown.)
 * @since 1.4
 */
 public RuntimeException(Throwable cause) {
 super(cause);
 } 
}

public class Exception extends Throwable {
 static final long serialVersionUID = -3387516993124229948L;
 /**
 * Constructs a new exception with <code>null</code> as its detail message.
 * The cause is not initialized, and may subsequently be initialized by a
 * call to {@link #initCause}.
 */
 public Exception() {
 super();
 }
 /**
 * Constructs a new exception with the specified detail message. The
 * cause is not initialized, and may subsequently be initialized by
 * a call to {@link #initCause}.
 *
 * @param message the detail message. The detail message is saved for 
 *  later retrieval by the {@link #getMessage()} method.
 */
 public Exception(String message) {
 super(message);
 }
 /**
 * Constructs a new exception with the specified detail message and
 * cause. <p>Note that the detail message associated with
 * <code>cause</code> is <i>not</i> automatically incorporated in
 * this exception's detail message.
 *
 * @param message the detail message (which is saved for later retrieval
 *  by the {@link #getMessage()} method).
 * @param cause the cause (which is saved for later retrieval by the
 *  {@link #getCause()} method). (A <tt>null</tt> value is
 *  permitted, and indicates that the cause is nonexistent or
 *  unknown.)
 * @since 1.4
 */
 public Exception(String message, Throwable cause) {
 super(message, cause);
 }
 /**
 * Constructs a new exception with the specified cause and a detail
 * message of <tt>(cause==null ? null : cause.toString())</tt> (which
 * typically contains the class and detail message of <tt>cause</tt>).
 * This constructor is useful for exceptions that are little more than
 * wrappers for other throwables (for example, {@link
 * java.security.PrivilegedActionException}).
 *
 * @param cause the cause (which is saved for later retrieval by the
 *  {@link #getCause()} method). (A <tt>null</tt> value is
 *  permitted, and indicates that the cause is nonexistent or
 *  unknown.)
 * @since 1.4
 */
 public Exception(Throwable cause) {
 super(cause);
 }
}

public class Throwable implements Serializable {
 public Throwable(String message) {
 fillInStackTrace();
 detailMessage = message;
 }
 
 /**
 * Fills in the execution stack trace. This method records within this
 * <code>Throwable</code> object information about the current state of
 * the stack frames for the current thread.
 *
 * @return a reference to this <code>Throwable</code> instance.
 * @see java.lang.Throwable#printStackTrace()
 */
 public synchronized native Throwable fillInStackTrace();
 
 /**
 * Provides programmatic access to the stack trace information printed by
 * {@link #printStackTrace()}. Returns an array of stack trace elements,
 * each representing one stack frame. The zeroth element of the array
 * (assuming the array's length is non-zero) represents the top of the
 * stack, which is the last method invocation in the sequence. Typically,
 * this is the point at which this throwable was created and thrown.
 * The last element of the array (assuming the array's length is non-zero)
 * represents the bottom of the stack, which is the first method invocation
 * in the sequence.
 *
 * <p>Some virtual machines may, under some circumstances, omit one
 * or more stack frames from the stack trace. In the extreme case,
 * a virtual machine that has no stack trace information concerning
 * this throwable is permitted to return a zero-length array from this
 * method. Generally speaking, the array returned by this method will
 * contain one element for every frame that would be printed by
 * <tt>printStackTrace</tt>.
 *
 * @return an array of stack trace elements representing the stack trace
 *  pertaining to this throwable.
 * @since 1.4
 */
 public StackTraceElement[] getStackTrace() {
 return (StackTraceElement[]) getOurStackTrace().clone();
 }
 private synchronized StackTraceElement[] getOurStackTrace() {
 // Initialize stack trace if this is the first call to this method
 if (stackTrace == null) {
  int depth = getStackTraceDepth();
  stackTrace = new StackTraceElement[depth];
  for (int i=0; i < depth; i++)
  stackTrace[i] = getStackTraceElement(i);
 }
 return stackTrace;
 }
 
 /**
 * Returns the number of elements in the stack trace (or 0 if the stack
 * trace is unavailable).
 *
 * package-protection for use by SharedSecrets.
 */
 native int getStackTraceDepth();
 /**
 * Returns the specified element of the stack trace.
 *
 * package-protection for use by SharedSecrets.
 *
 * @param index index of the element to return.
 * @throws IndexOutOfBoundsException if <tt>index &lt; 0 ||
 *  index &gt;= getStackTraceDepth() </tt>
 */
 native StackTraceElement getStackTraceElement(int index);
 
 /**
 * Returns a short description of this throwable.
 * The result is the concatenation of:
 * <ul>
 * <li> the {@linkplain Class#getName() name} of the class of this object
 * <li> ": " (a colon and a space)
 * <li> the result of invoking this object's {@link #getLocalizedMessage}
 * method
 * </ul>
 * If <tt>getLocalizedMessage</tt> returns <tt>null</tt>, then just
 * the class name is returned.
 *
 * @return a string representation of this throwable.
 */
 public String toString() {
 String s = getClass().getName();
 String message = getLocalizedMessage();
 return (message != null) ? (s + ": " + message) : s;
 }

@Test
 public void testException(){
 try {
 String str =null;
 System.out.println(str.charAt(0));
 }catch (Exception e){
 throw new AppException("000001","空指針異常");
 }
 }

000001[空指針異常]
Process finished with exit code -1