Deprecated
jdk 1.4 mow includes this idea as part of the standard Throwable/Exception classes.
| Modifier and Type | Field and Description |
|---|---|
| pack-priv Throwable | |
| pack-priv static final String |
| Access | Constructor and Description |
|---|---|
| public | |
| public | |
| public | |
| public |
| Modifier and Type | Method and Description |
|---|---|
| public Throwable | |
| public void | printStackTrace(PrintWriter
PrintWriter to use for outputOverrides java. Prints this throwable and its backtrace to the specified print writer. |
| public void | printStackTrace(PrintStream
PrintStream to use for outputOverrides java. Prints this throwable and its backtrace to the specified print stream. |
| public void | printStackTrace()
Overrides java. Prints this throwable and its backtrace to the standard error stream. |
| private void |
| nested | back to summary |
|---|---|
| pack-priv Throwable nested | |
| NESTED_MSG | back to summary |
|---|---|
| pack-priv static final String NESTED_MSG | |
| PotentiallySecondaryException | back to summary |
|---|---|
| public PotentiallySecondaryException(String msg, Throwable t) | |
| PotentiallySecondaryException | back to summary |
|---|---|
| public PotentiallySecondaryException(Throwable t) | |
| PotentiallySecondaryException | back to summary |
|---|---|
| public PotentiallySecondaryException(String msg) | |
| PotentiallySecondaryException | back to summary |
|---|---|
| public PotentiallySecondaryException() | |
| getNestedThrowable | back to summary |
|---|---|
| public Throwable getNestedThrowable() Implements com. | |
| printStackTrace | back to summary |
|---|---|
| public void printStackTrace(PrintWriter pw) Overrides java. Doc from java. Prints this throwable and its backtrace to the specified print writer.
| |
| printStackTrace | back to summary |
|---|---|
| public void printStackTrace(PrintStream ps) Overrides java. Doc from java. Prints this throwable and its backtrace to the specified print stream.
| |
| printStackTrace | back to summary |
|---|---|
| public void printStackTrace() Overrides java. Doc from java. Prints this throwable and its backtrace to the
standard error stream. This method prints a stack trace for this
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 the 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
| |
| setNested | back to summary |
|---|---|
| private void setNested(Throwable t) | |