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| </aside> |
| <main class="article default-main full-800" data-ceiling="topbar"> |
| <div class="article-banner"> |
| <p>You are viewing the documentation for a prerelease version.</p> |
| </div> |
| <div class="article-header"> |
| <nav class="crumbs" aria-label="breadcrumbs"> |
| <ul> |
| <li class="crumb">Cassandra</li> |
| <li class="crumb"><a href="../new/index.html">What’s new</a></li> |
| <li class="crumb"><a href="java17.html">Support for Java</a></li> |
| </ul> |
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| <div class="tools" role="navigation"> |
| <ul> |
| <li class="tool edit"><a href="https://github.com/apache/cassandra/edit/cassandra-5.0/doc/modules/cassandra/pages/reference/java17.adoc" title="Edit Page" target="_blank" rel="noopener">Edit</a></li> |
| </ul> |
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| </div> |
| <article class="doc"> |
| <h1 class="page">Support for Java</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The support matrix for the Java versions for compiling and running |
| Apache Cassandra is detailed in Table 1. The build version is along |
| the vertical axis and the run version is along the horizontal axis.</p> |
| </div> |
| <table class="tableblock frame-all grid-all" style="width: 68%;"> |
| <caption class="title">Support Matrix for Java</caption> |
| <colgroup> |
| <col style="width: 34%;"> |
| <col style="width: 30%;"> |
| <col style="width: 36%;"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Java 11 (Run)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Java 17 (Run)</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Java 11 (Build)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Supported</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Experimental Support</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Java 17(Build)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Not Supported</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Experimental in CI</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>Apache 5.0 source code built with Java 17 cannot be run with Java 11. |
| All binary releases are built with Java 11.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="using-java-11-to-build"><a class="anchor" href="#using-java-11-to-build"></a>Using Java 11 to Build</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>To start with, install Java 11. |
| As an example, for installing Java 11 on RedHat Linux the command is as follows:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-console hljs" data-lang="console">$ sudo yum install java-11-openjdk</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Set the environment variables <code>JAVA_HOME</code> and <code>PATH</code>.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-console hljs" data-lang="console">$ export JAVA_HOME=/usr/lib/jvm/java-11-openjdk |
| $ export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Download and install Apache Cassandra 5.0 source code from the Git along |
| with the dependencies.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-console hljs" data-lang="console">$ git clone https://github.com/apache/cassandra.git</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>If Cassandra is already running stop Cassandra with the following |
| command.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-console hljs" data-lang="console">$ ./nodetool stopdaemon</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Build the source code from the <code>cassandra</code> directory, which has the |
| <code>build.xml</code> build script. The Apache Ant uses the Java version set in |
| the <code>JAVA_HOME</code> environment variable.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-console hljs" data-lang="console">$ cd ~/cassandra |
| $ ant</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Apache Cassandra 5.0 gets built with Java 11. Set the environment |
| variable for <code>CASSANDRA_HOME</code> in the bash script. Also add the |
| <code>CASSANDRA_HOME/bin</code> to the <code>PATH</code> variable.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-console hljs" data-lang="console">$ export CASSANDRA_HOME=~/cassandra |
| $ export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin:$CASSANDRA_HOME/bin</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>To run Apache Cassandra 5.0 with either of Java 11 or Java 17 run the |
| Cassandra application in the <code>CASSANDRA_HOME/bin</code> directory, which is in |
| the <code>PATH</code> env variable.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-console hljs" data-lang="console">$ cassandra</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The Java version used to run Cassandra gets output as Cassandra is |
| getting started. As an example if Java 11 is used, the run output should |
| include similar to the following output snippet:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-console hljs" data-lang="console">INFO [main] 2019-07-31 21:18:16,862 CassandraDaemon.java:480 - Hostname: ip-172-30-3- |
| 146.ec2.internal:7000:7001 |
| INFO [main] 2019-07-31 21:18:16,862 CassandraDaemon.java:487 - JVM vendor/version: OpenJDK |
| 64-Bit Server VM/11.0.3 |
| INFO [main] 2019-07-31 21:18:16,863 CassandraDaemon.java:488 - Heap size: |
| 1004.000MiB/1004.000MiB</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The following output indicates a single node Cassandra 5.0 cluster has started.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-console hljs" data-lang="console">INFO [main] 2019-07-31 21:18:19,687 InboundConnectionInitiator.java:130 - Listening on |
| address: (127.0.0.1:7000), nic: lo, encryption: enabled (openssl) |
| ... |
| ... |
| INFO [main] 2019-07-31 21:18:19,850 StorageService.java:512 - Unable to gossip with any |
| peers but continuing anyway since node is in its own seed list |
| INFO [main] 2019-07-31 21:18:19,864 StorageService.java:695 - Loading persisted ring state |
| INFO [main] 2019-07-31 21:18:19,865 StorageService.java:814 - Starting up server gossip |
| INFO [main] 2019-07-31 21:18:20,088 BufferPool.java:216 - Global buffer pool is enabled, |
| when pool is exhausted (max is 251.000MiB) it will allocate on heap |
| INFO [main] 2019-07-31 21:18:20,110 StorageService.java:875 - This node will not auto |
| bootstrap because it is configured to be a seed node. |
| ... |
| ... |
| INFO [main] 2019-07-31 21:18:20,809 StorageService.java:1507 - JOINING: Finish joining ring |
| INFO [main] 2019-07-31 21:18:20,921 StorageService.java:2508 - Node 127.0.0.1:7000 state |
| jump to NORMAL</code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="using-java-17-to-build"><a class="anchor" href="#using-java-17-to-build"></a>Using Java 17 to Build</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>If Java 17 is used to build Apache Cassandra 5.0, first Java 17 must be installed and the environment variables set. |
| As an example, to download and install Java 17 on RedHat Linux run the following command.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-console hljs" data-lang="console">$ yum install java-17-openjdk</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Set the environment variables <code>JAVA_HOME</code> and <code>PATH</code>.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-console hljs" data-lang="console">$ export JAVA_HOME=/usr/lib/jvm/java-17-openjdk |
| $ export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The build output should now include the following.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-console hljs" data-lang="console">[echo] Non default JDK version used: 17 |
| ... |
| ... |
| _build_java: |
| [echo] Compiling for Java 17 |
| ... |
| ... |
| build: |
| |
| _main-jar: |
| [copy] Copying 1 file to /home/ec2-user/cassandra/build/classes/main/META-INF |
| [jar] Building jar: /home/ec2-user/cassandra/build/apache-cassandra-5.0-SNAPSHOT.jar |
| ... |
| ... |
| _build-test: |
| [javac] Compiling 739 source files to /home/ec2-user/cassandra/build/test/classes |
| [copy] Copying 25 files to /home/ec2-user/cassandra/build/test/classes |
| ... |
| ... |
| jar: |
| [mkdir] Created dir: /home/ec2-user/cassandra/build/classes/stress/META-INF |
| [mkdir] Created dir: /home/ec2-user/cassandra/build/tools/lib |
| [jar] Building jar: /home/ec2-user/cassandra/build/tools/lib/stress.jar |
| [mkdir] Created dir: /home/ec2-user/cassandra/build/classes/fqltool/META-INF |
| [jar] Building jar: /home/ec2-user/cassandra/build/tools/lib/fqltool.jar |
| |
| BUILD SUCCESSFUL |
| Total time: 1 minute 3 seconds</code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="common-issues"><a class="anchor" href="#common-issues"></a>Common Issues</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The Java 17 built Apache Cassandra 5.0 source code may be run with Java 17 only. |
| If a Java 17 built code is run with Java 11 the following error message gets output.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-console hljs" data-lang="console">$ echo $JAVA_HOME |
| /usr/lib/jvm/java-11-openjdk |
| $ cassandra |
| ... |
| ... |
| Error: LinkageError occurred while loading main class org.apache.cassandra.service.CassandraDaemon |
| java.lang.UnsupportedClassVersionError: org/apache/cassandra/service/CassandraDaemon has been compiled by a more |
| recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file |
| versions up to 55.0 |
| ...</code></pre> |
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