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- Written by Nam Ha Minh
- Last Updated on 07 August 2019   |   Print Email
By default, Eclipse uses the JRE on which it is running, as the default JRE for workspaces and Java projects. In practice, we may need several JRE versions for different testing purposes. Eclipse allows us to manage different installations of JRE and doing so is pretty easy.Of course you must have different JREs installed on your computer first (for example: JRE 5, JRE 6, and JRE 7). In Eclipse, click
Window > Preferences from main menu (or shortcut:
Alt + W + P). In the
Preferences dialog, expand the branch
Java > Installed JREs:
As we see, Eclipse lists all JREs in the
Installed JREs table with the default one checked. Note that Eclipse does not scan all installed JREs automatically (except the default one that runs Eclipse itself), so we have to add/remove other JRE versions manually here.To add an installed JRE version to the table, click
Add button. The
Add JRE dialog appears:
Select
Standard VM (default selected), then click
Next. In the next screen,
JRE Definition, click
Directory button to locate installation directory of the desired JRE:
Wait a few seconds for Eclipse loading JRE system libraries jar files, and then click
Finish. The newly added JRE is shown in the table:
If you want to use the newly added JRE as the default, select the appropriate checkbox.To edit or remove a JRE, click the corresponding button
Edit or
Remove.
NOTES:- You can pick a JDK installation directory instead of a JRE one, as Eclipse can load the JRE inside a JDK installation.
- When you change the default JRE, it does not affect the existing projects in workspace. The change will apply for the new projects only.
- The installed JREs configuration is per workspace. That means different workspaces may have different set of installed JREs.
Other Eclipse Tutorials:
About the Author:
Nam Ha Minh is certified Java programmer (SCJP and SCWCD). He started programming with Java in the time of Java 1.4 and has been falling in love with Java since then. Make friend with him on
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his Java videos you YouTube.