120 lines
8.5 KiB
HTML
120 lines
8.5 KiB
HTML
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<meta name="DC.Title" content="Java i5/OS PASE environment variables" />
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<meta name="abstract" content="The Java virtual machine (JVM) uses the following variables to start i5/OS PASE environments. You need to set the QIBM_JAVA_PASE_STARTUP variable in order to run the IBM i5/OS PASE native method for Java example." />
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<title>Java i5/OS PASE
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environment variables</title>
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</head>
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<body id="rzahapasejavaenvvariables"><a name="rzahapasejavaenvvariables"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Java <span class="keyword">i5/OS</span> PASE
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environment variables</h1>
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<div><p>The Java™ virtual machine (JVM) uses the following variables
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to start <span class="keyword">i5/OS™</span> PASE environments.
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You need to set the QIBM_JAVA_PASE_STARTUP variable in order to run the IBM<sup>®</sup> <span class="keyword">i5/OS</span> PASE native method for Java example.</p>
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<p>For information about setting environment variables for the example, see
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the following topic:</p>
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<blockquote> <p><a href="rzahapaseenvvariables.htm">Environment variables for
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the IBM <span class="keyword">i5/OS</span> PASE example</a>.</p>
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</blockquote>
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<dl><dt class="dlterm"><strong>QIBM_JAVA_PASE_STARTUP</strong></dt>
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<dd>You need to set this environment variable when both of the following conditions
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occur: <ul><li>You are using <span class="keyword">i5/OS</span> PASE
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native methods</li>
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<li>You are starting Java from an iSeries™ command prompt or Qshell command
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prompt</li>
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</ul>
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The JVM uses this environment variable to start a PASE environment.
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The value of the variable identifies an <span class="keyword">i5/OS</span> PASE
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startup program. Your iSeries server includes two <span class="keyword">i5/OS</span> PASE
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startup programs: <ul><li>/usr/lib/start32: Starts a 32-bit <span class="keyword">i5/OS</span> PASE
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environment</li>
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<li>/usr/lib/start64: Starts a 64-bit <span class="keyword">i5/OS</span> PASE
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environment</li>
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</ul>
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The bit format of all shared library objects used by an <span class="keyword">i5/OS</span> PASE environment must match
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the bit format of the <span class="keyword">i5/OS</span> PASE
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environment. <p>You cannot use this variable when starting Java from
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an <span class="keyword">i5/OS</span> PASE terminal
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session. An <span class="keyword">i5/OS</span> PASE
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terminal session always uses a 32-bit <span class="keyword">i5/OS</span> PASE
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environment. Any JVMs started from an <span class="keyword">i5/OS</span> PASE
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terminal session use the same type of PASE environment as the terminal session.</p>
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</dd>
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</dl>
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<dl><dt class="dlterm"><strong>QIBM_JAVA_PASE_CHILD_STARTUP</strong></dt>
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<dd>Set this optional environment variable when the <span class="keyword">i5/OS</span> PASE
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environment for a secondary JVM must be different than the <span class="keyword">i5/OS</span> PASE
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environment the primary JVM. A call to Runtime.exec() in Java starts
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a secondary (or child) JVM. <p>For more information, see <a href="rzahapaseexmplschildstartup.htm">Using
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QIBM_JAVA_PASE_CHILD_STARTUP</a>.</p>
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</dd>
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</dl>
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<dl><dt class="dlterm"><strong>QIBM_JAVA_PASE_ALLOW_PREV</strong></dt>
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<dd>Set this optional environment variable when you want to use the current <span class="keyword">i5/OS</span> PASE environment, if one exists.
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In certain situations, it is difficult to determine whether an <span class="keyword">i5/OS</span> PASE
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environment already exists. Using QIBM_JAVA_PASE_ALLOW_PREV and QIBM_JAVA_PASE_STARTUP
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in combination enables the JVM to either use an existing <span class="keyword">i5/OS</span> PASE
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environment or start a new <span class="keyword">i5/OS</span> PASE
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environment. <p>For more information, see <a href="rzahapaseexmplsallowprev.htm">Using
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QIBM_JAVA_PASE_ALLOW_PREV</a>.<strong></strong></p>
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</dd>
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</dl>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzahapaseenvvariables.htm">Examples: Environment variables for the IBM i5/OS PASE example</a></strong><br />
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To use the IBM <span class="keyword">i5/OS</span> PASE
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native methods for Java example, you need to set environment
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variables.</li>
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<li class="ulchildlink"><strong><a href="rzahapaseexmplschildstartup.htm">Using QIBM_JAVA_PASE_CHILD_STARTUP</a></strong><br />
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The QIBM_JAVA_PASE_CHILD_STARTUP environment variable indicates
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the <span class="keyword">i5/OS</span> PASE startup
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program for any secondary JVMs.</li>
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<li class="ulchildlink"><strong><a href="rzahapaseexmplsallowprev.htm">Using QIBM_JAVA_PASE_ALLOW_PREV</a></strong><br />
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Sometimes it is difficult to determine whether an <span class="keyword">i5/OS</span> PASE environment
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already exists. Using the optional environment variable QIBM_JAVA_PASE_ALLOW_PREV
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in combination with QIBM_JAVA_PASE_STARTUP enables the JVM to determine whether
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to use the current <span class="keyword">i5/OS</span> PASE environment (if one exists) or start a new
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<span class="keyword">i5/OS</span> PASE environment.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzahapaseexmplsmain.htm" title="The iSeries Java virtual machine (JVM) supports the use of native methods running in the i5/OS PASE environment. Prior to V5R2, the native iSeries JVM used only ILE native methods.">IBM i5/OS PASE native methods for Java</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzahapaseerrors.htm" title="To help you troubleshoot i5/OS PASE native methods, this topic describes error conditions that are indicated by i5/OS job log messages and Java runtime exceptions. The following lists describe errors that you may encounter at start up or at run time when using i5/OS PASE native methods for Java.">Java i5/OS PASE error codes</a></div>
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<div><a href="rzahapaseexmplslibrary.htm" title="To use native method libraries, especially when you want to manage multiple versions of a native method library on your iSeries server, you need to understand both the Java library naming conventions and the library search algorithm.">Managing native method libraries</a></div>
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<div><a href="rzahapaseexmpls.htm" title="The IBM i5/OS PASE native method for Java example calls an instance of a native C method that then uses Java Native Interface (JNI) to call back into Java code. Rather than accessing the string directly from Java code, the example calls a native method that then calls back into Java through JNI to get the string value.">Example: IBM i5/OS PASE native method for Java</a></div>
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</div>
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</div>
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</body>
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</html> |