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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →You can test an early-access (EA) JDK without replacing your current Java installation: download it from an official source, verify the archive, extract it into a separate directory, and select it only for the shell or project you are testing. Keep your stable JDK as the everyday default. EA builds are intended for testing upcoming changes, not production use.
Choose an installation method that keeps the JDK separate
The most reversible approach is to use an official archive and extract it to a new, user-owned directory, such as ~/jdks/jdk-ea-<build> on a Unix-like system. Do not extract over the directory containing your current JDK. Oracle documents archive installation in a writable location on Linux, and multiple installed JDKs with explicit selection on macOS: Oracle’s Linux installation guide and Oracle’s macOS installation guide.
Installer behavior depends on the distributor and platform. For example, Oracle’s Windows JDK 24 installer documentation describes limits on installing multiple versions from the same feature release and replacement behavior for updates. That is Oracle-installer guidance, not a rule for every vendor or archive. Check the instructions for the exact EA distribution you chose, and do not overwrite an active JDK directory.
Install and select the EA build for a test
1. Record which Java installation is active
Before changing anything, note the results of java -version and javac -version. Also inspect JAVA_HOME and the executable your shell finds—for example, command -v java in common Unix shells. The equivalent commands differ on Windows. This baseline helps reveal whether your runtime and compiler were already coming from different installations.
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2. Get and verify the exact build
Download the EA build from the JDK project’s official EA page or a distributor’s official EA channel. Record its exact version or build identifier; EA artifacts change, and supported operating systems and architectures depend on the current offering. Adoptium describes tagged EA builds and download patterns in its tagged early-access builds article and early-access builds article. Use the vendor’s current download page to confirm what is available rather than assuming an older example remains current.
Before extracting, compare the archive with the publisher’s SHA-256 checksum or verify its GPG signature when provided. Adoptium documents both verification options in its archive installation guidance. A successful check confirms the file matches the publisher-provided reference; it does not certify the EA build for production.
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3. Extract into a new directory
Use a unique directory that does not contain your stable JDK. On Linux, Oracle says an archive can be installed in a writable location without root access. Its documentation also warns about overwriting an installation directory with the same name. Archive layouts vary: on macOS, the JDK home inside an archive may be under Contents/Home.
4. Set the JDK for one terminal session
In a Unix-like shell, set JAVA_HOME to the actual JDK home and put its bin directory first on PATH:
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export JAVA_HOME="$HOME/jdks/jdk-ea-<build>"
export PATH="$JAVA_HOME/bin:$PATH"
java -version
javac -versionReplace the example path with the extracted JDK’s real home. This changes the current shell and programs launched from it; it does not establish a universal Windows procedure or change the system default. On macOS, use the correct home within the archive, or select a JDK by its full path or with /usr/libexec/java_home, as Oracle documents in its macOS guide. Shell startup files and environment-variable syntax differ by operating system and shell, so avoid adding the EA path to a global configuration unless you intend to change the default for every relevant session.
5. Confirm both runtime and compiler
Run java -version and javac -version after setting the environment. Both should identify the intended EA build. If either reports the stable JDK, check the value of JAVA_HOME, the order of directories in PATH, and the resolved executable. Do not begin testing until you know which JDK is actually selected.
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Use the EA JDK with a project build tool
A build tool can select a JDK independently of the Java found by your interactive shell. Gradle toolchains can detect locally installed JDKs and use them for project compilation and execution. Gradle’s current guide says automatic downloads cover GA releases, not EA versions, so install the EA build yourself and configure Gradle to detect or locate that local installation. See Gradle’s JVM toolchains guide.
For project testing, prefer a project-specific toolchain or launcher configuration over changing the machine-wide Java default. Confirm the JDK reported or selected by the build tool itself; a successful java -version in your terminal does not by itself prove Gradle is using that same JDK.
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Return to your normal Java setup
If you selected the EA build only in a dedicated terminal, close that shell when testing is complete; new sessions will use their usual environment. If you changed a project launcher or configuration, restore the prior setting when the test is over. You can remove the separate EA directory once it is no longer needed, but first confirm it is not shared with another project or managed by a system package. Leave the stable JDK installation intact.
What to know before relying on an EA build
Adoptium describes EA builds as useful for testing changes in the developing codebase and says they are not for production use. Keep the stable JDK available for ordinary work, and treat each EA version as a test target rather than a replacement for your normal runtime.
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