Import Maven Project to Eclipse and Fix the errors

Question

I made imported a project to eclipse and I have a lot of errors in every class name even classes like String ...

the error in the classes I made is Implicit super constructor Object() is undefined for default constructor. Must define an explicit constructor

and inside the methods <Class> cannot be resolved to a type even to IOException I am getting IOException cannot be resolved to a type

so what should I do ? I tried to build , clean again with no use

UPDATE : also I am getting Description

Plugin execution not covered by lifecycle configuration: org.apache.maven.plugins:maven-resources-plugin:2.4.3:resources (execution: default-resources, phase: process-resources)   pom.xml /test line 6    Maven Project Build Lifecycle Mapping Problem

Answer 1

The project that you imported is a Maven project. What you should do is open the pom.xml file located in the root of the project and add the following plugin in the plugin management part of the file:

<build>
    <pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.eclipse.m2e</groupId>
                <artifactId>lifecycle-mapping</artifactId>
                <version>1.0.0</version>
                <configuration>
                    <lifecycleMappingMetadata>
                        <pluginExecutions>
                            <pluginExecution>
                                <pluginExecutionFilter>
                                    <groupId>org.apache.maven.plugins</groupId>
                                    <artifactId>maven-resources-plugin</artifactId>
                                    <versionRange>[2.0,)</versionRange>
                                    <goals>
                                        <goal>resources</goal>
                                        <goal>testResources</goal>
                                    </goals>
                                </pluginExecutionFilter>
                                <action>
                                    <ignore />
                                </action>
                            </pluginExecution>
                        </pluginExecutions>
                    </lifecycleMappingMetadata>
                </configuration>
            </plugin>
        </plugins>
    </pluginManagement>
</build>

Then right click the project, go to Maven and Update project configuration.

This should fix it.