Eclipse中的Java资源文件夹错误

Question

i am importing a spring maven project in eclipse (helios with maven plugin) i built the project in terminal, and everything is ok, and eclipse shows no errors in xml or java classes, but still it shows an error mark on Java Resources Folder, no idea why ? any ideas ?

Answer 1

Well, it might just be because there are some folders containing classes which are treated as source folders by maven (that's why the maven command line compile works) but not as such when using .m2 eclipse plugin to import your project into eclipse.

Here's some things you might try:

in the properties of your eclipse project, go to java build path, select sources, and check to see if all needed source fodlers are added (as source folders). If some are missing, just add them manually using add sources... button

Sometimes, once you do a maven clean in the command line, the eclipse project will show errors because it no longer finds the compiled classes (they were cleaned by maven). Doing a Project-> clean on your eclipse project usually solves this

Try adding the project into eclipse as a plain ole eclipse project: do a mvn eclipse:eclipse, then import it into eclipse as eclipse project (not maven project)

Answer 2

I faced similar issue and resolved it by changing the facet for Java to 1.8 as I was using Java 1.8 version and the facet was set to 1.6. You can go to the project properties and try changing the facet type.

Answer 3

I fixed it by add these plugins into the pom.xml after that Maven > Update Project. Then the error was disappeared.

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>3.2.2</version>
            <configuration>
                <warSourceDirectory>src/main/webapp</warSourceDirectory>
                <failOnMissingWebXml>false</failOnMissingWebXml>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.0</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
</build>

Answer 4

检查环境变量path和java_home。

Answer 5

This is the problem with Eclipse some times when you build the project from Terminal. There are a few common steps that we need to apply to solve these kinds of problems.

1. Choose Project and clean option from the menu option
2. Right Click on Project --> Maven --> Update project

Either one should work definitely.