I downgraded from Windows 11 to Windows 10 today and had to reinstall the Eclipse-IDE.
After successfully importing my workspaces and fixing the projects, a warning appeared for every project saying "Project XXX has no explicit encoding set". I've already searched for a solution and only got some fixes for VSCode.
I had Eclipse 2021-6 and installed Eclipse 2022-6
5 Answers
Yes, the warning for projects with no explicit default encoding is a new thing in Eclipse 2022-06 (4.24).
To set an explicit default encoding do one of the following:
- In the Problems view, select the warning, hit Ctrl+1 and apply the provided Quick Fix (sets the project encoding explicitly to the workspace encoding)
- Change the project manually in Project > Properties: Resource
See also my video showing and explaining this.
When using a build system like Maven or Gradle, set the encoding as follows instead:
Maven
- In
pom.xmlset the propertyproject.build.sourceEncodingtoUTF-8:<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties> - Right-click the project folder and choose Maven > Update Project...
Gradle
- In
build.gradlesetcompileJava.options.encodingtoUTF-8:compileJava.options.encoding = 'UTF-8'
- Right-click the project folder and choose Gradle > Refresh Gradel Project
- As long as Eclipse Buildship issue #344 is not fixed, change the encoding manually as described above
If you prefer to ignore this warning for all projects you can change the preferences:
General -> Workspace -> Report missing project encoding as: Ignore
If you're using Maven, every time you run "Update project" the warning comes back, as the project configuration is re-created from the POM file. To get rid of this warning permanently, add this in your POM file:
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
Then, run "Update project" and the warning is gone. You can find more info here:
If you are using Maven, add something similar to the following to your pom.xml:
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>${maven.resources.plugin.version}</version>
<configuration>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
If you want to make this part of Eclipse settings (through eclipse task in Gradle, for example), create a file named "org.eclipse.core.resources.prefs" in .settings folder with these contents -
eclipse.preferences.version=1
encoding/<project>=UTF-8
This would be the command in gradle's eclipse task -
new File(".settings", "org.eclipse.core.resources.prefs").text = """eclipse.preferences.version=1
encoding/<project>=UTF-8
"""
