"Please refer to the JCDK 25.0 Release Notes for more information on updates and fixes. Conversion of Version 54 Class Files (from JDK 10) Converting Java class files into Java Card CAP and Export files is at the heart of the Java Card technology and makes the Converter tool provided in the Java Card Development Kit Tools a critical component of its deployment model (see Unique Verification and Deployment Model for more information )."
"Java Card is based on a subset of the Java language because the Java Card Virtual Machine, Runtime Environment, and APIs are designed to run security services on tamper-resistant, secure hardware with limited memory and CPU resources to meet the highest levels of security certification requirements. For these reasons, the Java Card Virtual Machine supports a limited number of Java bytecodes. For example, there is no need to support multianewarray because multi-dimensional arrays are not supported or monitorenter/monitorexit because threads are not supported."
JCDK 25.0 comprises Tools, Simulator, and an Eclipse Plug-in and updates the Converter to accept class file version 54 (from JDK 10). Converting Java class files into CAP and Export files remains a core deployment step, with the Converter critical for producing deployable Java Card artifacts. The Java Card platform supports a restricted subset of Java and a limited set of bytecodes because the VM, runtime, and APIs target tamper-resistant secure hardware with constrained memory and CPU while meeting strict security certification requirements. Several Java features and bytecodes, such as multianewarray and thread-related monitorenter/monitorexit, are not supported. Prior support required class file version 51 (-release 7).
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