java.lang.Object java.lang.Throwable java.lang.Exception javax.xml.xpath.XPathException
public class XPathException
XPathException represents a generic XPath exception.
Constructor Summary | |
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XPathException
(
String
message) Constructs a new XPathException with the specified detail message. |
|
XPathException
(
Throwable
cause) Constructs a new XPathException with the specified cause. |
Method Summary | |
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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
(
PrintStream
Prints this throwable and its backtrace to the specified print stream. |
void |
printStackTrace
(
PrintWriter
Prints this throwable and its backtrace to the specified print writer. |
Methods inherited from class java.lang. Object |
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clone , equals , finalize , getClass , hashCode , notify , notifyAll , wait , wait , wait |
Constructor Detail |
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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.
public XPathException(Throwable cause)
Constructs a new XPathException with the specified cause.
If cause is null, then a NullPointerException is thrown.
Method Detail |
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public ThrowablegetCause ()
This implementation returns the cause that was supplied via one of the constructors requiring a Throwable , or that was set after creation with the Throwable.initCause(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.
public void printStackTrace ( PrintStream s)
public void printStackTrace ()
This example was produced by running the program:java.lang.NullPointerException at MyClass.mash(MyClass.java:9) at MyClass.crunch(MyClass.java:6) at MyClass.main(MyClass.java:3)
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 moreNote 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 { }
public void printStackTrace ( PrintWriter s)