Validity - the following are invalid:

• Java class file version is 46.1
• Java class file contains extraneous bytes at end of file
• PNG file does not contain required pHYs chunk
• Initial class file references class that doesn't implement Xlet
• Application locks static system object
• Application fails to deregister event listeners

Interoperability - examples of Non-Interoperability

• Class file references undefined member or class in platform package
• Class file references platform method that must throw SecurityException
• Class file references non-existent member of class in application package
• Application assumes fixed graphics plane configuration

Security

• Class file references privileged operation (method) that requires permission, but does not request permission or is not signed
• Application contains resource that exploits implementation defect in order to insert and execute native code
• Class file passes null reference or other value to platform class that exploits implementation defect in JVM or API implementation, possibly causing JVM failure or override of JVM security framework
• Application accidentally or intentionally creates denial of service incident by consuming all resources (CPU or memory) or by saturating return channel with traffic
• Application contains non-obfuscated class files

Efficiency

• Application contains class files or members that are not referenced by any execution path
• Application contains superfluous hash (digest), signature, certificate, or permission files
• Application contains other data files not referenced by any execution path or defined platform mechanism
• Application resource contains optional constructs that should not be present or for which universal support is not required