Troubleshooting DataStax Studio 6.8

The DataStax Enterprise Help Center also provides troubleshooting information.

Studio will not start with wrong Java version

Studio checks the JAVA_HOME environment variable at startup. To ensure that Studio starts with the correct version of Java, make sure the JAVA_HOME environment variable points to the installation directory with the supported version of Java. See Supported platforms. Note that even when the java -version command shows a supported Java version, it is possible that JAVA_HOME environment variable is not set to the correct Java installation directory.

Out of memory error (OOM)

Studio crashes during runtime or startup and the following stack trace is observed in the log:

Exception in thread "Thread-0" java.lang.OutOfMemoryError: Java heap space
        at java.util.Arrays.copyOfRange(Unknown Source)
        at java.lang.String.<init>(Unknown Source)
        at java.lang.String.substring(Unknown Source)
Uncaught error from thread []: Java heap space, shutting down JVM since 'akka.jvm-exit-on-fatal-error' is enabled for for ActorSystem[Studio]
java.lang.OutOfMemoryError: Java heap space

Fix this problem by increasing the max heap allocation (-Xmx) for Studio’s Java Virtual Machine (JVM). For more, see Specifying JVM settings for DataStax Studio.

NOT ENABLED error: AlwaysOn SQL cell cannot be executed

The AlwaysOn SQL cell cannot be executed when the connection is to a DSE cluster that is not correctly configured for the AlwaysOn SQL service.

In order to run AlwaysOn SQL, you must have:

STOPPED error: AlwaysOn SQL cell cannot be executed

The AlwaysOn SQL cell cannot be executed when the AlwaysOn SQL service is stopped on the DSE node. See Checking the status of AlwaysOn SQL.

HTTP protocol

DataStax Studio does not run with HTTPS everywhere. Preface the URL used to run DataStax Studio with HTTP and not HTTPS.

Studio won’t accept connections from external addresses

By default, Studio binds itself to the IP address (or localhost). Please refer to Configuring DataStax Studio for details on how to change the listen IP address.

Content assist not working

On MacOS 10.12, a network configuration issue when running Studio causes content assist functionality to become slow or unresponsive. For troubleshooting steps to resolve this networking issue, see this Stack Overflow post.

Unable to connect Studio to a secured DSE cluster

If you are unable to connect Studio when client-to-node encryption enabled on a DSE cluster, the Studio log has this entry:

Cannot support TLS_RSA_WITH_AES_256_CBC_SHA with currently installed providers

Prior to Oracle Java 8u161, the Java Cryptography Extension (JCE) Unlimited Strength Policy was not enabled by default. On older versions of Oracle Java, the policy files are required to ensure support for all encryption algorithms. See Oracle’s instructions on Enabling Unlimited Cryptographic Policy for Java on installing the policy files for Studio’s Java Virual Machine.

Notebook needs troubleshooting

When you export a notebook, you can specify actions for the notebook. As appropriate, select to include cell code and results or cell code only. For either of these actions, you can also select to include diagnostics. Exporting a notebook with diagnostics might include sensitive information. Credentials are not included in the export.

Studio UI behaves strangely after upgrade

If you leave an old Studio session open in a browser, using an older version of Studio, and then upgrade to a new version, you can experience strange behavior. This is caused by caching in the browser. You can solve this problem by force-loading the index.html page. For example, if using the Chrome browser, you can navigate to the top-level index.html page and click on the refresh button while holding down the control key.

Starting Studio on Windows

While running Studio on the Microsoft Windows operating system, out-of-date libraries can prevent system-specific JNI libraries from being loaded correctly. The result is the following stack trace on Windows 10:

[] ERROR ID:  TS: - head of empty list
java.util.NoSuchElementException: head of empty list
    at scala.collection.immutable.Nil$.head(List.scala:420) ~[scala-library-2.11.8.jar:?]
    at scala.collection.immutable.Nil$.head(List.scala:417) ~[scala-library-2.11.8.jar:?]
    at ~[akka-actor_2.11-2.4.17.jar:?]
    at ~[akka-actor_2.11-2.4.17.jar:?]
    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257) ~[akka-actor_2.11-2.4.17.jar:?]
    at ~[akka-actor_2.11-2.4.17.jar:?]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(

And the following stack trace on Windows 7:

leveldbjni-64-1-6036870325998847314.8: Can't find dependent libraries]
        at org.fusesource.hawtjni.runtime.Library.doLoad(
        at org.fusesource.hawtjni.runtime.Library.load(
        at org.fusesource.leveldbjni.JniDBFactory.<clinit>(
        at com.rbmhtechnology.eventuate.log.leveldb.LeveldbEventLog.<init>(Level dbEventLog.scala:97)
        at com.rbmhtechnology.eventuate.log.leveldb.LeveldbEventLog$$anonfun$7.apply(LeveldbEventLog.scala:358)
        at com.rbmhtechnology.eventuate.log.leveldb.LeveldbEventLog$$anonfun$7.apply(LeveldbEventLog.scala:358)

You can fix this problem by updating the Microsoft Visual C++ 2010 Redistributable Package libraries in question:

When deciding whether to download the 32-bit or 64-bit version of the MS Visual C libraries, you should use the version that *matches the OS architecture*. Even if your node is running a 64-bit OS, it's possible that you have 64-bit or 32-bit (or both) MS Visual C libraries installed.

  • If you have 64-bit MS Visual C++ installed, update your node with the 64-bit libraries.

  • If you have 32-bit MS Visual C++ installed, update your node with the 32-bit libraries.

  • If you have both 64-bit and 32-bit MS Visual C installed, DataStax recommends that you uninstall the version that does not match your system. For example, if your OS is 64-bit, uninstall the 32-bit (x86) Visual C. Doing so avoids a potential issue where the wrong version may be found and used by Studio.

To determine the installed MS Visual C architecture (x64 or x86, or both), open Settings, Apps & features, and search for "c".

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