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Preverification is a new phase in the development and
deployment cycle for Java applications designed to run on
the J2ME CLDC.
Preverification performs certain checks on the Java
bytecodes ahead of runtime. If this first verification pass
is ok, the preverifier annotates the classfiles (using
standard Java bytecode "attributes", so that these are still
plain old Java bytecodes and will be executable in VMs not
aware of the benefits of preverification), and then saves
the annotated class files or passes them along to the next
tool in the compile chain.
When the KVM attempts to run execute a J2ME CLDC-based
application, it checks the Java class files for these
preverification annotations. Proper annotations in the class
files guarantee that certain compile-time checks were made,
and so the KVM can pass through its own verfication and
security checks much faster and start executing the
application more quickly.
Sun's CLDC reference implementation SDK includes the
'preverify' tool. You use the tool after compiling your code
via javac (or your favorite Java compiler). More information
on preverify is included in the CLDC specification and in
the developer docs included with the CLDC SDK.
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