Added in API level 8

Summary: Ctors | Methods | Inherited Methods

XPathException

public class XPathException
extends Exception

java.lang.Object
↳	java.lang.Throwable
	↳	java.lang.Exception
		↳	javax.xml.xpath.XPathException

Known direct subclasses XPathExpressionException, XPathFactoryConfigurationException XPathExpressionException XPathExpressionException represents an error in an XPath expression.  XPathFactoryConfigurationException XPathFactoryConfigurationException represents a configuration error in a XPathFactory environment.

Known indirect subclasses XPathFunctionException XPathFunctionException XPathFunctionException represents an error with an XPath function.

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XPathException represents a generic XPath exception.

Summary

Public constructors
XPathException(String message) Constructs a new XPathException with the specified detail message.
XPathException(Throwable cause) Constructs a new XPathException with the specified cause.

Public methods
Throwable	getCause() Returns the cause of this throwable or null if the cause is nonexistent or unknown.
void	printStackTrace() Prints this throwable and its backtrace to the standard error stream.
void	printStackTrace(PrintWriter s) Prints this throwable and its backtrace to the specified print writer.
void	printStackTrace(PrintStream s) Prints this throwable and its backtrace to the specified print stream.

Inherited methods
From class java.lang.Throwable final void addSuppressed(Throwable exception) Appends the specified exception to the exceptions that were suppressed in order to deliver this exception. Throwable fillInStackTrace() Fills in the execution stack trace. Throwable getCause() Returns the cause of this throwable or null if the cause is nonexistent or unknown. String getLocalizedMessage() Creates a localized description of this throwable. String getMessage() Returns the detail message string of this throwable. StackTraceElement[] getStackTrace() Provides programmatic access to the stack trace information printed by printStackTrace(). final Throwable[] getSuppressed() Returns an array containing all of the exceptions that were suppressed, typically by the try-with-resources statement, in order to deliver this exception. Throwable initCause(Throwable cause) Initializes the cause of this throwable to the specified value. void printStackTrace() Prints this throwable and its backtrace to the standard error stream. void printStackTrace(PrintWriter s) Prints this throwable and its backtrace to the specified print writer. void printStackTrace(PrintStream s) Prints this throwable and its backtrace to the specified print stream. void setStackTrace(StackTraceElement[] stackTrace) Sets the stack trace elements that will be returned by getStackTrace() and printed by printStackTrace() and related methods. String toString() Returns a short description of this throwable.
From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. final Class<?> getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait(long timeoutMillis, int nanos) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait(long timeoutMillis) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait() Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Public constructors

XPathException

Added in API level 8

public XPathException (String message)

Constructs a new XPathException with the specified detail message.

The cause is not initialized.

If message is null, then a NullPointerException is thrown.

Parameters
message	String: The detail message.

XPathException

Added in API level 8

public XPathException (Throwable cause)

Constructs a new XPathException with the specified cause.

If cause is null, then a NullPointerException is thrown.

Parameters
cause	Throwable: The cause.

Throws
NullPointerException	if cause is null.

Public methods

getCause

Added in API level 8

public Throwable getCause ()

Returns the cause of this throwable or null if the cause is nonexistent or unknown. (The cause is the throwable that caused this throwable to get thrown.)

This implementation returns the cause that was supplied via one of the constructors requiring a Throwable, or that was set after creation with the initCause(java.lang.Throwable) method. While it is typically unnecessary to override this method, a subclass can override it to return a cause set by some other means. This is appropriate for a "legacy chained throwable" that predates the addition of chained exceptions to Throwable. Note that it is not necessary to override any of the PrintStackTrace methods, all of which invoke the getCause method to determine the cause of a throwable.

Returns
Throwable	the cause of this throwable or null if the cause is nonexistent or unknown.

printStackTrace

Added in API level 8

public void printStackTrace ()

Prints this throwable and its backtrace to the standard error stream. This method prints a stack trace for this Throwable object on the error output stream that is the value of the field System.err. The first line of output contains the result of the toString() method for this object. Remaining lines represent data previously recorded by the method fillInStackTrace(). The format of this information depends on the implementation, but the following example may be regarded as typical:

 java.lang.NullPointerException
         at MyClass.mash(MyClass.java:9)
         at MyClass.crunch(MyClass.java:6)
         at MyClass.main(MyClass.java:3)
 

This example was produced by running the program:

 class MyClass {
     public static void main(String[] args) {
         crunch(null);
     }
     static void crunch(int[] a) {
         mash(a);
     }
     static void mash(int[] b) {
         System.out.println(b[0]);
     }
 }
 

The backtrace for a throwable with an initialized, non-null cause should generally include the backtrace for the cause. The format of this information depends on the implementation, but the following example may be regarded as typical:

 HighLevelException: MidLevelException: LowLevelException
         at Junk.a(Junk.java:13)
         at Junk.main(Junk.java:4)
 Caused by: MidLevelException: LowLevelException
         at Junk.c(Junk.java:23)
         at Junk.b(Junk.java:17)
         at Junk.a(Junk.java:11)
         ... 1 more
 Caused by: LowLevelException
         at Junk.e(Junk.java:30)
         at Junk.d(Junk.java:27)
         at Junk.c(Junk.java:21)
         ... 3 more
 

Note the presence of lines containing the characters "...". These lines indicate that the remainder of the stack trace for this exception matches the indicated number of frames from the bottom of the stack trace of the exception that was caused by this exception (the "enclosing" exception). This shorthand can greatly reduce the length of the output in the common case where a wrapped exception is thrown from same method as the "causative exception" is caught. The above example was produced by running the program:

 public class Junk {
     public static void main(String args[]) {
         try {
             a();
         } catch(HighLevelException e) {
             e.printStackTrace();
         }
     }
     static void a() throws HighLevelException {
         try {
             b();
         } catch(MidLevelException e) {
             throw new HighLevelException(e);
         }
     }
     static void b() throws MidLevelException {
         c();
     }
     static void c() throws MidLevelException {
         try {
             d();
         } catch(LowLevelException e) {
             throw new MidLevelException(e);
         }
     }
     static void d() throws LowLevelException {
        e();
     }
     static void e() throws LowLevelException {
         throw new LowLevelException();
     }
 }

 class HighLevelException extends Exception {
     HighLevelException(Throwable cause) { super(cause); }
 }

 class MidLevelException extends Exception {
     MidLevelException(Throwable cause)  { super(cause); }
 }

 class LowLevelException extends Exception {
 }
 

As of release 7, the platform supports the notion of suppressed exceptions (in conjunction with the try-with-resources statement). Any exceptions that were suppressed in order to deliver an exception are printed out beneath the stack trace. The format of this information depends on the implementation, but the following example may be regarded as typical:

 Exception in thread "main" java.lang.Exception: Something happened
  at Foo.bar(Foo.java:10)
  at Foo.main(Foo.java:5)
  Suppressed: Resource$CloseFailException: Resource ID = 0
          at Resource.close(Resource.java:26)
          at Foo.bar(Foo.java:9)
          ... 1 more
 

Note that the "... n more" notation is used on suppressed exceptions just as it is used on causes. Unlike causes, suppressed exceptions are indented beyond their "containing exceptions."

An exception can have both a cause and one or more suppressed exceptions:

 Exception in thread "main" java.lang.Exception: Main block
  at Foo3.main(Foo3.java:7)
  Suppressed: Resource$CloseFailException: Resource ID = 2
          at Resource.close(Resource.java:26)
          at Foo3.main(Foo3.java:5)
  Suppressed: Resource$CloseFailException: Resource ID = 1
          at Resource.close(Resource.java:26)
          at Foo3.main(Foo3.java:5)
 Caused by: java.lang.Exception: I did it
  at Foo3.main(Foo3.java:8)
 

Likewise, a suppressed exception can have a cause:

 Exception in thread "main" java.lang.Exception: Main block
  at Foo4.main(Foo4.java:6)
  Suppressed: Resource2$CloseFailException: Resource ID = 1
          at Resource2.close(Resource2.java:20)
          at Foo4.main(Foo4.java:5)
  Caused by: java.lang.Exception: Rats, you caught me
          at Resource2$CloseFailException.<init>(Resource2.java:45)
          ... 2 more
 

printStackTrace

Added in API level 8

public void printStackTrace (PrintWriter s)

Prints this throwable and its backtrace to the specified print writer.

Parameters
s	PrintWriter: PrintWriter to use for output

printStackTrace

Added in API level 8

public void printStackTrace (PrintStream s)

Prints this throwable and its backtrace to the specified print stream.

Parameters
s	PrintStream: PrintStream to use for output