CCM extension that starts Cassandra (and related tools) under Java 8
ccm-java8 is a CCM extension that explicitly sets the
JAVA_HOME environment variable for all CCM-managed
Cassandra nodes (and related tools) to an available Java 8 installation, which is required to run Cassandra 3.11 and lower.
Platforms Currently Supported:
ccm-java8 is available on PyPI.
Install it alongside CCM:
pip install ccm ccm-java8
Run CCM commands as normal.
Cassandra and various tools will launch using the Java 8 VM.
If no Java 8 VM can be found, CCM will refuse to start. Install Java 8 if this occurs.
Many operating systems support the side-by-side installation of multiple Java versions, yet only one version can be selected as the default
(i.e., what version of
java is on
bin/cassandra launch script prefers the
java binary under
$JAVA_HOME, and will fallback to using the
java binary on
$JAVA_HOME isn't set.
$JAVA_HOME or the platform default is explicitly set to a Java 8 installation, Cassandra will try, and fail, to start under an incompatible Java version.
ccm-java8 works by registering a CCM extension that when loaded by CCM explicitly sets the
JAVA_HOME environment variable to a directory containing a Java 8 installation, or throws an exception otherwise.
Older versions used to register a hook into the
append_to_server_env function, but this function doesn't get called for tools (
The current version sets the
JAVA_HOME environment variable globally in the CCM Python process, which gets inherited by all sub-processes launched by CCM.
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.