Java Reference
In-Depth Information
Enables or disables the tracing of method calls depending on
the value of
on
. If
on
is
true
, this method suggests that the
virtual machine emit debugging information for each method
when it is called.
The format of this debugging information and the file or other output
stream to which it is emitted depend on the host environment. Each vir-
tual machine is free to do what it wants with these calls, including ig-
noring them if the local runtime system has nowhere to put the trace
output, although they are likely to work in a development environment.
These methods are fairly low-level debugging tools. Typically, a virtual
machine will also support high-level debuggers and profilers through the
JVM
™
Tool Interface (
JVMTI
); interested readers should consult that spe-
cification for more information.
