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In the Java ecosystem, as the new releases of JDK are introduced at least once a year, we'll probably need to switch to a newer version at some point.
In this quick tutorial, we'll show how to check the available JREs, add a JRE to Eclipse, and change a Java version in an Eclipse project, so we'll be ready when that time comes.
2. Check Whether the JRE Is Available in Eclipse
After being sure that we have installed the version that we want to use, we'll need to ensure that it's available to use in Eclipse.
Let's take a look at Window ->Preferences, and within that, Java -> Installed JREs:
- In Eclipse with Java 9 Support for Oxygen (see below), you can open the type in a JavaSE-9 JRE and perform Show In Package Explorer. Inside the 'JRE System Library' node, the Package Explorer will show the module in which that type resides. Eclipse.ini summary.
- The Eclipse Foundation - home to a global community, the Eclipse IDE, Jakarta EE and over 375 open source projects, including runtimes, tools and frameworks.
- The Eclipse Classic provides superior Java editing with incremental compilation, the Plug-in Development Environment PDE, complete source code for the Eclipse Platform, and much more. This is the 64-bit version.
- The following are links to older Simultaneous Release packages distributed by the Eclipse Foundation and the correlated Eclipse Platform version number. Eclipse Europa Packages (2007 - v 3.3) Eclipse Ganymede Packages (2008 - v 3.4) Eclipse Ganymede SR1 Packages (v 3.4.1) Eclipse Ganymede SR2 Packages (v 3.4.2) Eclipse Galileo Packages (2009 - v 3.5) Eclipse Galileo SR1 Packages (v 3.5.1) Eclipse Galileo SR2 Packages (v 3.5.2) Eclipse Helios Packages (2010 - v 3.6) Eclipse.
If the JRE we want is listed, then we're good to go.
But, suppose we need to use JRE 9, 10, or 11. Since we only have JDK 8 installed, we'll have to add it to Eclipse.
3. Adding a JRE to Eclipse
Next, from the Window ->Preferences dialog, let's click the Add… button. From here, we need to specify the JRE type. We'll choose Standard VM:
And finally, let's specify the location of the new JRE (under the JRE home) and click Finish:
As a result, we now have two JREs configured in our IDE:
4. Change the Java Version of Our Project
Now, let's suppose that we were using Java 8 in our project and now we want to change it to Java 10:
First, we'll navigate to the Project properties and then to the Java Build Path:
and hit the Remove button on the existing JRE:
Now, we'll use the Add Library button and choose the JRE System Library:
Let's choose JavaSE-10 from the JDK that we recently installed and click the Finish button:
Now, as we can see, we've correctly configured our project's Java Build Path:
We need to do one additional step — make sure we're using the correct Compiler Compliance Level for the Java Compiler:
World one chair humanscale as seen on tv. In our case it says Java 10, so we're all good:
In case the Compiler Compliance Level is not the correct one, we can simply uncheck the Use compliance from execution environment option and choose the correct one.
Eclipse Version 7
In this quick article, we learned how to add a new JRE into our Eclipse workspace and how to switch to a different Java version in our current Eclipse project.