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JBoss 7.2 with JDK 11

If you are using the MySQL JDBC driver 8.0.x to install a new Magnolia instance, you may encounter the following error:JBoss 7.2 with JDK 11 to deploy Magnolia, you may get an error during installation. To resolve the issue, add the following lines to WEB-INF/jboss-deployment-structure.xml:

<deployment>
 <dependencies>
  <module name="jdk.unsupported"/>
 </dependencies>
</deployment>

MySQL JDBC 8.0.x

If you are using the MySQL JDBC driver 8.0.x to install a new Magnolia instance, you may encounter the following error:

2020-02-14 14:35:07,538 ERROR org.apache.jackrabbit.core.RepositoryImpl: failed to start Repository: org.apache.jackrabbit.core.

2020-02-14 14:35:07,538 ERROR org.apache.jackrabbit.core.RepositoryImpl : failed to start Repository: org.apache.jackrabbit.core.state.ItemStateException: failed to read bundle (stacktrace on DEBUG log level): deadbeef-face-babe-cafe-babecafebabe: java.sql.SQLSyntaxErrorException: Table '<DATABASE_NAME>.<TABLE_NAME>' doesn't exist

This happens only when you :

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install a new instance from scratch

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or create database tables during installation

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To resolve the issue. As a workaround, use JDBC 5.1.x or create the tables manually in your database.

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2009-11-24 13:02:14,970 ERROR org.apache.catalina.session.ManagerBase : 
IOException while loading persisted sessions

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Until the JCR bug is fixed, do not use searchfn. To get the correct order, execute JCR XPath queries directly.

DL4J issues

There are limitations related to the deep learning and search features of the Find Bar, which are provided by the Periscope and Periscope Result Ranker modules.

Off-heap memory starvation

You should configure DL4J memory limits to avoid off-heap memory starvation. This is particularly the case with the -Dorg.bytedeco.javacpp.maxbytes JVM argument. For more details, see MGNLPER-121.

Periscope prevents deploying the public webapp as ROOT along with the author instance

When experiencing this issue, the following message can be found in the logs: java.lang.NoClassDefFoundError: Could not initialize class org.nd4j.linalg.factory. The issue may appear even on more than just one Tomcat instance, running on the same VM and the same JDK.

The ndj4 library can only be initiated once. Therefore, result ranking on public instances should be disabled, which you can do either by changing the configuration of the Periscope Result Ranker module, or rather by completely removing the magnolia-periscope-result-ranker module from your WAR package. After this modification, the search function will be available but search results will not be ranked. For more details see MGNLPER-112.