Running in Modular Java

4.2 4.1 4.0 3.12 3.11 3.10 3.9 3.8 3.7 3.6 3.5

Java project Jigsaw brought a new Module System into Java 9 and newer. Hazelcast supports running in the modular environment. If you want to run your application with Hazelcast libraries on the modulepath, use the following module names:

  • com.hazelcast.core for hazelcast-<version>.jar and hazelcast-enterprise-<version>.jar

  • com.hazelcast.client for hazelcast-client-<version>.jar and hazelcast-enterprise-client-<version>.jar

Don’t use hazelcast-all-<version>.jar or hazelcast-enterprise-all-<version>.jar on the modulepath as it could lead to problems in module dependencies for your application. You can still use them on the classpath.

The Java Module System comes with stricter visibility rules. It affects Hazelcast which uses internal Java API to reach the best performance results.

Hazelcast needs the java.se module and access to the following Java packages for a proper work:

  • java.base/jdk.internal.ref

  • java.base/java.nio (reflective access)

  • java.base/sun.nio.ch (reflective access)

  • java.base/java.lang (reflective access)

  • jdk.management/com.ibm.lang.management.internal (reflective access)

  • jdk.management/com.sun.management.internal (reflective access)

  • java.management/sun.management (reflective access)

You can provide the access to the above mentioned packages by using --add-exports and --add-opens (for the reflective access) Java arguments.

Example: Running a member on the classpath

java --add-modules java.se \
  --add-exports java.base/jdk.internal.ref=ALL-UNNAMED \
  --add-opens java.base/java.lang=ALL-UNNAMED \
  --add-opens java.base/java.nio=ALL-UNNAMED \
  --add-opens java.base/sun.nio.ch=ALL-UNNAMED \
  --add-opens java.management/sun.management=ALL-UNNAMED \
  --add-opens jdk.management/com.ibm.lang.management.internal=ALL-UNNAMED \
  --add-opens jdk.management/com.sun.management.internal=ALL-UNNAMED \
  -jar hazelcast-<version>.jar

Example: Running a member on the modulepath

java --add-modules java.se \
  --add-exports java.base/jdk.internal.ref=com.hazelcast.core \
  --add-opens java.base/java.lang=com.hazelcast.core \
  --add-opens java.base/java.nio=com.hazelcast.core \
  --add-opens java.base/sun.nio.ch=com.hazelcast.core \
  --add-opens java.management/sun.management=com.hazelcast.core \
  --add-opens jdk.management/com.ibm.lang.management.internal=com.hazelcast.core \
  --add-opens jdk.management/com.sun.management.internal=com.hazelcast.core \
  --module-path lib \
  --module com.hazelcast.core/com.hazelcast.core.server.StartServer

This example expects hazelcast-<version>.jar placed in the lib directory.

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