Program: 71868
Project: 71868
Buggy source:
/** 
 * Returns the platform MXBean proxy for  {@code mxbeanInterface} which is specified to have one singleinstance in a Java virtual machine and the proxy will forward the method calls through the given  {@code MBeanServerConnection}. This method may return   {@code null} if the management interfaceis not implemented in the Java virtual machine being monitored (for example, a Java virtual machine with no compilation system does not implement  {@link CompilationMXBean}); otherwise, this method is equivalent to calling: <pre>  {@link #getPlatformMXBeans(MBeanServerConnection,Class) getPlatformMXBeans(connection, mxbeanInterface)}.get(0); </pre>
 * @param connection the {@code MBeanServerConnection} to forward to.
 * @param mxbeanInterface a management interface for a platformMXBean with one single instance in the Java virtual machine being monitored, if implemented.
 * @return the platform MXBean proxy forforwarding the method calls of the  {@code mxbeanInterface}through the given   {@code MBeanServerConnection}, or   {@code null} if not exist.
 * @throws IllegalArgumentException if {@code mxbeanInterface}is not a platform management interface or not a singleton platform MXBean.
 * @throws java.io.IOException if a communication problemoccurred when accessing the  {@code MBeanServerConnection}.
 * @see #newPlatformMXBeanProxy
 * @since 1.7
 */
public static <T extends PlatformManagedObject>T getPlatformMXBean(MBeanServerConnection connection,Class<T> mxbeanInterface) throws java.io.IOException {
  PlatformComponent pc=PlatformComponent.getPlatformComponent(mxbeanInterface);
  if (pc == null)   throw new IllegalArgumentException(mxbeanInterface.getName() + "String_Node_Str");
  if (!pc.isSingleton())   throw new IllegalArgumentException(mxbeanInterface.getName() + "String_Node_Str");
  return pc.getSingletonMXBean(connection,mxbeanInterface);
}

Fixed version (ground truth):
/** 
 * Returns the platform MXBean proxy for  {@code mxbeanInterface} which is specified to have one singleinstance in a Java virtual machine and the proxy will forward the method calls through the given  {@code MBeanServerConnection}. This method may return   {@code null} if the management interfaceis not implemented in the Java virtual machine being monitored (for example, a Java virtual machine with no compilation system does not implement  {@link CompilationMXBean}); otherwise, this method is equivalent to calling: <pre>  {@link #getPlatformMXBeans(MBeanServerConnection,Class) getPlatformMXBeans(connection, mxbeanInterface)}.get(0); </pre>
 * @param connection the {@code MBeanServerConnection} to forward to.
 * @param mxbeanInterface a management interface for a platformMXBean with one single instance in the Java virtual machine being monitored, if implemented.
 * @param < T > an {@code mxbeanInterface} type parameter
 * @return the platform MXBean proxy forforwarding the method calls of the  {@code mxbeanInterface}through the given   {@code MBeanServerConnection}, or   {@code null} if not exist.
 * @throws IllegalArgumentException if {@code mxbeanInterface}is not a platform management interface or not a singleton platform MXBean.
 * @throws java.io.IOException if a communication problemoccurred when accessing the  {@code MBeanServerConnection}.
 * @see #newPlatformMXBeanProxy
 * @since 1.7
 */
public static <T extends PlatformManagedObject>T getPlatformMXBean(MBeanServerConnection connection,Class<T> mxbeanInterface) throws java.io.IOException {
  PlatformComponent pc=PlatformComponent.getPlatformComponent(mxbeanInterface);
  if (pc == null)   throw new IllegalArgumentException(mxbeanInterface.getName() + "String_Node_Str");
  if (!pc.isSingleton())   throw new IllegalArgumentException(mxbeanInterface.getName() + "String_Node_Str");
  return pc.getSingletonMXBean(connection,mxbeanInterface);
}