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:: com :: sun :: star :: java ::
deprecated | interface XJavaVM |
Usage Restrictions deprecated Deprecation Info A UNO interface seems to be at the wrong abstraction level for this functionality (also, the C++ classes `jvmaccess::VirtualMachine` and `jvmaccess::UnoVirtualMachine` used by XJavaVM::getJavaVM are not part of the public C++ UNO runtime API). This should probably be replaced by an appropriate C/C++ API. Description must be implemented by the user of the XJavaVM.

Methods' Summary
getJavaVM | returns the address of the Java Virtual Machine.
isVMStarted | returns true if the VM is started successfully, otherwise false.
isVMEnabled | Returns true if the VM is enabled.

Methods' Details
getJavaVM
any
getJavaVM( | [in] sequence< byte > | processID );
Description returns the address of the Java Virtual Machine. If the VM is not already instantiated, it will be now. If the `processID` is a normal 16-byte ID, the returned `any` contains a JNI `JavaVM` pointer as a `long` or `hyper` integer (depending on the platform). If the `processID` does not match the current process, or if the VM cannot be instantiated for whatever reason, a void `any` is returned. If the `processID` has an additional 17th byte of value `0`, the returned `any` contains a non–reference-counted pointer to a (reference-counted) instance of the C++ `jvmaccess::VirtualMachine` class, always represented as a `hyper` integer. The pointer is guaranteed to be valid as long as the reference to this XJavaVM is valid (but the pointer should be converted into a reference-counted reference as soon as possible). Again, if the first 16 bytes of the `processID` do not match the current process, or if the VM cannot be instantiated for whatever reason, a void `any` is returned. If the `processID` has an additional 17th byte of value `1`, the returned `any` contains a non–reference-counted pointer to a (reference-counted) instance of the C++ `jvmaccess::UnoVirtualMachine` class, always represented as a `hyper` integer. The pointer is guaranteed to be valid as long as the reference to this XJavaVM is valid. Again, if the first 16 bytes of the `processID` do not match the current process, or if the VM cannot be instantiated for whatever reason, a void `any` is returned. The first form (returning a JNI `JavaVM` pointer) is mainly for backwards compatibility, new code should use the second form (returning a pointer to a `jvmaccess::VirtualMachine`) if it does not want to use the Java UNO environment, and it should use the third form (returning a pointer to a `jvmaccess::UnoVirtualMachine`) if it wants to use the Java UNO environment. For example, one advantage of using `jvmaccess::VirtualMachine` instead of the raw `JavaVM` pointer is that whenever you attach a native thread to the Java virtual machine, that thread's context `ClassLoader` (see `java.lang.Thread.getContextClassLoader`) will automatically be set to a meaningful value. Parameter processID The process ID of the caller's process, possibly extended by a 17th byte of value `0` or `1`. Returns On success, the `any` contains a pointer represented as `long` or `hyper`, otherwise the `any` is void.
isVMStarted
boolean
isVMStarted();
Description returns true if the VM is started successfully, otherwise false.
isVMEnabled
boolean
isVMEnabled();
Description Returns true if the VM is enabled. It is only possible to get the VM, if this method return 0.

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