117 lines
8.9 KiB
HTML
117 lines
8.9 KiB
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<meta name="DC.Title" content="Using QIBM_JAVA_PASE_ALLOW_PREV" />
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<meta name="abstract" content="Sometimes it is difficult to determine whether an i5/OS PASE environment already exists. Using the optional environment variable QIBM_JAVA_PASE_ALLOW_PREV in combination with QIBM_JAVA_PASE_STARTUP enables the JVM to determine whether to use the current i5/OS PASE environment (if one exists) or start a new i5/OS PASE environment." />
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<meta name="description" content="Sometimes it is difficult to determine whether an i5/OS PASE environment already exists. Using the optional environment variable QIBM_JAVA_PASE_ALLOW_PREV in combination with QIBM_JAVA_PASE_STARTUP enables the JVM to determine whether to use the current i5/OS PASE environment (if one exists) or start a new i5/OS PASE environment." />
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<title>Using QIBM_JAVA_PASE_ALLOW_PREV</title>
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<body id="rzahapaseexmplsallowprev"><a name="rzahapaseexmplsallowprev"><!-- --></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">Using QIBM_JAVA_PASE_ALLOW_PREV</h1>
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<div><p>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.</p>
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<p>To use these two environment variables in combination, set them to the
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following values:</p>
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<ul><li>Set QIBM_JAVA_PASE_STARTUP to the default startup program</li>
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<li>Set QIBM_JAVA_PASE_ALLOW_PREV to 1</li>
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</ul>
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<p>For example, an application that optionally starts an <span class="keyword">i5/OS</span> PASE environment
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calls the program that starts the JVM. In this case, by using the previous
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settings, the program is able to use the current <span class="keyword">i5/OS</span> PASE environment,
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if one exists, or start a new <span class="keyword">i5/OS</span> PASE environment.</p>
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<p>The following table identifies any <span class="keyword">i5/OS</span> PASE environments that result
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from the various combinations of <span class="keyword">i5/OS</span> PASE environment and definitions of
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QIBM_JAVA_PASE_STARTUP and QIBM_JAVA_PASE_ALLOW_PREV:</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><caption>Table 1. <span class="keyword">i5/OS</span> PASE environments resulting from combinations
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of <span class="keyword">i5/OS</span> PASE environment and definitions of QIBM_JAVA_PASE_STARTUP and QIBM_JAVA_PASE_ALLOW_PREV</caption><thead align="left"><tr valign="bottom"><th colspan="3" align="center" valign="bottom" id="d0e72">Starting environment</th>
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<th align="center" valign="bottom" width="26.13065326633166%" id="d0e74">Resulting behavior</th>
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</tr>
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<tr valign="bottom"><th align="center" valign="bottom" width="24.623115577889447%" id="d0e77"><span class="keyword">i5/OS</span> PASE environment</th>
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<th align="center" valign="bottom" width="24.623115577889447%" id="d0e82">QIBM_JAVA _PASE_STARTUP</th>
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<th align="center" valign="bottom" width="24.623115577889447%" id="d0e84">QIBM_JAVA_PASE _ALLOW_PREV </th>
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<th align="center" valign="bottom" width="26.13065326633166%" id="d0e86">JVM <span class="keyword">i5/OS</span> PASE Startup</th>
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</tr>
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</thead>
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<tbody><tr valign="middle"><td valign="middle" width="24.623115577889447%" headers="d0e72 d0e77 ">None</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e82 ">Not defined</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e84 ">Not defined*</td>
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<td valign="middle" width="26.13065326633166%" headers="d0e74 d0e86 ">No <span class="keyword">i5/OS</span> PASE environment</td>
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</tr>
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<tr valign="middle"><td valign="middle" width="24.623115577889447%" headers="d0e72 d0e77 ">None</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e82 ">Not defined</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e84 ">Defined '1'</td>
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<td valign="middle" width="26.13065326633166%" headers="d0e74 d0e86 ">No <span class="keyword">i5/OS</span> PASE environment</td>
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</tr>
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<tr valign="middle"><td valign="middle" width="24.623115577889447%" headers="d0e72 d0e77 ">None</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e82 ">Defined startX</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e84 ">Not defined*</td>
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<td valign="middle" width="26.13065326633166%" headers="d0e74 d0e86 ">Use startX</td>
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</tr>
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<tr valign="middle"><td valign="middle" width="24.623115577889447%" headers="d0e72 d0e77 ">None</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e82 ">Defined startX</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e84 ">Defined '1'</td>
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<td valign="middle" width="26.13065326633166%" headers="d0e74 d0e86 ">Use startX</td>
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</tr>
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<tr valign="middle"><td valign="middle" width="24.623115577889447%" headers="d0e72 d0e77 ">Started</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e82 ">Not defined</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e84 ">Not defined*</td>
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<td valign="middle" width="26.13065326633166%" headers="d0e74 d0e86 ">Use existing <span class="keyword">i5/OS</span> PASE environment</td>
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</tr>
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<tr><td valign="middle" width="24.623115577889447%" headers="d0e72 d0e77 ">Started</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e82 ">Not defined</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e84 ">Defined '1'</td>
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<td valign="middle" width="26.13065326633166%" headers="d0e74 d0e86 ">Use existing <span class="keyword">i5/OS</span> PASE environment </td>
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</tr>
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<tr><td valign="middle" width="24.623115577889447%" headers="d0e72 d0e77 ">Started</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e82 ">Defined startX</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e84 ">Not defined*</td>
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<td valign="middle" width="26.13065326633166%" headers="d0e74 d0e86 ">Not allowed: JVM error during startup</td>
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</tr>
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<tr><td valign="middle" width="24.623115577889447%" headers="d0e72 d0e77 ">Started</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e82 ">Defined startX</td>
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<td valign="middle" width="24.623115577889447%" headers="d0e72 d0e84 ">Defined '1'</td>
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<td valign="middle" width="26.13065326633166%" headers="d0e74 d0e86 ">Use existing <span class="keyword">i5/OS</span> PASE environment </td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>* "Not defined" means that QIBM_JAVA_PASE_ALLOW_PREV is either not included
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or has a value other than 1.</p>
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<p>The last two rows in the previous table indicate situations where it is
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useful to set QIBM_JAVA_PASE_ALLOW_PREV. The JVM checks QIBM_JAVA_PASE_ALLOW_PREV
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when an <span class="keyword">i5/OS</span> PASE environment already exists and you have defined QIBM_JAVA_PASE_STARTUP.
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Otherwise, the JVM ignores QIBM_JAVA_PASE_ALLOW_PREV.</p>
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<p>The QIBM_JAVA_PASE_ALLOW_PREV and QIBM_JAVA_PASE_CHILD_STARTUP environment
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variables are independent of each other.</p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzahapasejavaenvvariables.htm" title="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.">Java i5/OS PASE environment variables</a></div>
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</div>
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</div>
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</body>
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