Deleting a JRE Definition
You can delete Java runtime environment definitions that are available for executing Java programs in the workbench.
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Open the
Java > Installed JREs preference page.
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Select the definition you want to delete and click Remove.
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Check the box for the definition that you want to use as the default JRE for the workbench.
Java development tools (JDT)
Working with JREs
Adding a new JRE definition
Choosing a default JRE
Choosing a JRE for launching a project
Installed JREs preference page