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Description Returns a Throwable object that contains a completed stack trace This object can be rethrown Returns the exception that underlies the current exception If there is no underlying exception, null is returned Returns a localized description of the exception Returns a description of the exception Returns an array that contains the stack trace, one element at a time, as an array of StackTraceElement The method at the top of the stack is the last method called before the exception was thrown This method is found in the first element of the array The StackTraceElement class gives your program access to information about each element in the trace, such as its method name Associates causeExc with the invoking exception as a cause of the invoking exception Returns a reference to the exception Displays the stack trace Sends the stack trace to the specified stream Sends the stack trace to the specified stream

[root@serverA myroot]# mkdir bin [root@serverA myroot]# cp /bin/bash bin/ [root@serverA myroot]# cp /bin/ls bin/

String getLocalizedMessage( ) String getMessage( ) StackTraceElement[ ] getStackTrace( )

Following are two possible solutions to the exercises. Remember that my solutions may vary somewhat from your own. It s the end result that matters. If your program produces the result you re after, then you ve succeeded.

Throwable initCause(Throwable causeExc) void printStackTrace( ) void printStackTrace(PrintStream stream) void printStackTrace(PrintWriter stream)

With the binaries there, we now need to check whether these binaries need any libraries We use the ldd command to determine what (if any) libraries are used by these two programs We run ldd against /bin/bash, like so:

void setStackTrace(StackTraceElement Sets the stack trace to the elements passed in elements[ ]) elements This method is for specialized applications, not normal use String toString( ) Returns a String object containing a description of the exception This method is called by println( ) when outputting a Throwable object

TABLE 10-3

[root@serverA myroot]# ldd /bin/bash linux-gateso1 => (0x00110000) libtinfoso5 => /lib/libtinfoso5 (0x031f3000) libdlso2 => /lib/libdlso2 (0x00c1c000) libcso6 => /lib/libcso6 (0x00a96000) /lib/ld-linuxso2 (0x00a77000)

Part I:

You may also wish to override one or more of these methods in exception classes that you create Exception defines four constructors Two were added by JDK 14 to support chained exceptions, described in the next section The other two are shown here: Exception( ) Exception(String msg) The first form creates an exception that has no description The second form lets you specify a description of the exception Although specifying a description when an exception is created is often useful, sometimes it is better to override toString( ) Here s why: The version of toString( ) defined by Throwable (and inherited by Exception) first displays the name of the exception followed by a colon, which is then followed by your description By overriding toString( ), you can prevent the exception name and colon from being displayed This makes for a cleaner output, which is desirable in some cases The following example declares a new subclass of Exception and then uses that subclass to signal an error condition in a method It overrides the toString( ) method, allowing a carefully tailored description of the exception to be displayed

We also run ldd against /bin/ls, like so:

// This program creates a custom exception type class MyException extends Exception { private int detail; MyException(int a) { detail = a; } public String toString() { return "MyException[" + detail + "]"; } } class ExceptionDemo { static void compute(int a) throws MyException { Systemoutprintln("Called compute(" + a + ")"); if(a > 10) throw new MyException(a); Systemoutprintln("Normal exit"); } public static void main(String args[]) { try { compute(1); compute(20); } catch (MyException e) { Systemoutprintln("Caught " + e); } } }

This example defines a subclass of Exception called MyException This subclass is quite simple: it has only a constructor plus an overloaded toString( ) method that displays the

[root@serverA myroot]# ldd /bin/ls linux-gateso1 => (0x00110000) librtso1 => /lib/librtso1 (0x0043b000) libselinuxso1 => /lib/libselinuxso1 (0x0041e000) libaclso1 => /lib/libaclso1 (0x00a47000) libcso6 => /lib/libcso6 (0x00a96000) libpthreadso0 => /lib/libpthreadso0 (0x00c23000) /lib/ld-linuxso2 (0x00a77000) libdlso2 => /lib/libdlso2 (0x00c1c000) libattrso1 => /lib/libattrso1 (0x00a40000)

Exercise 4-1

10:

Now that we know what libraries need to be in place, we create the lib directory and copy the libraries over First we create the /tmp/myroot/lib directory: