NonStop Server for Java Programmer's Reference (NSJ 4.0+)

Additional Files
In addition to the standard Java packages, the NonStop Server for Java 4 provides these files:
jtatmf.jar
File containing classes for the version of the NonStop Java Transaction Agent that uses TMF
javachk
The Java Checker program, which determines whether a problem with the Java VM is caused by an
incorrect TCP/IP configuration
BaseLibList
File used to create JavaLibList, which you can use at run time to determine whether an
UnsatisfiedLinkError will be thrown during a call to System.loadLibrary, if the library was
not linked in.
Additional Environment Variable
NonStop Server for Java 4 has an implementation-specific environment variable that you can use to control
the run-time environment. The JAVA_PTHREAD_MAX_TRANSACTION environment variable specifies the
maximum number of TMF transactions allowed per process. The default number allowed is 1000. For
detailed information, see Controlling Maximum Concurrent Transactions.
Java Native Interface (JNI)
The Sun Microsystems Java Native Interface (JNI) standard defines both the C-language APIs that enable
Java methods to call C and C++ methods and the way that C and C++ methods can start and interact with a
Java virtual machine (Java VM). The NonStop Server for Java 4 supports JNI and the Invocation API
with the following modifications:
You must relink the java executable whenever you use new C or C++ routines in your Java programs.●
Multithreaded native C or C++ routines must use the same Pthread library and wrappers that the
Java VM uses, but HP recommends that any multithreaded code be written in Java.
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If native C or C++ routines must invoke Transaction Management Facility (TMF) calls, you must use
TMF transaction jacket routines as described in the Open System Services Programmer's Guide in the
"Application Programming With Standard POSIX Threads" section under the topic "TMF Transaction
Jacket Routines." The calls are:
SPT_ABORTTRANSACTION()❍
SPT_BEGINTRANSACTION()❍
SPT_ENDTRANSACTION()❍
SPT_RESUMETRANSACTION()
Note: The Open System Services Programmer's Guide says that the maximum
concurrent transactions allowed in a process is 100; however, the Java VM is an
exception where the maximum allowed is 1000 as described under Controlling
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