The declared package does not match the expected package ""

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I am using Eclipse and have not used Java for sometime. However, I can compile my code on the command-line just fine and generate the necessary .class files. In Eclipse, it complains that The declared package "Devices" does not match the expected package "". What does this mean and how can I fix it?

Sample code:

package Devices;

public final class DevFrequency 
{
    public short messageID;
    public double frequency;
    public short converterID;
    public DevFrequency() 
    {
    }
    public DevFrequency(short _messageID,double _frequency,short _converterID)
    {
        messageID = _messageID;
        frequency = _frequency;
        converterID = _converterID;
    }
}

The name of my project is DeviceDDS.

eclipse java
23 Answers

I fix it just changing the name to lowercase and now Eclipse recognizes the package.

user_67848960

This problem got resolved by mentioning the package name

I moved my file Test_Steps.java which was under package stepDefinition

enter image description here

by just adding the package stepDefinition the problem got resolved

So this problem can occur when you have a package and you are not using in your class file.

Adding it has resolved the problem and the error was no longer appearing.

enter image description here

user_29862790

I faced this issue too when I had imported an existing project to eclipse. It was a gradle project, but while importing I imported it as regular project by clicking General-> Existing Projects into Workspace. To resolve the issue I've added Gradle nature to the project by :::: Right click on Project folder -> Configure-> Add Gradle Nature

user_24641720

I was using Spring Tool Suite 4. Not able to figure out the issue. The directory structure was according to the package name.

But cleaning the project helped me.

user_39256260

I had the same issue with a maven project in Eclipse IDE. I was able to resolve it by replacing the .classpath file with the correct format. After replacing close and open the project.

Sample .classpath file

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
    <classpathentry kind="src" output="target/classes" path="src/main/java">
        <attributes>
            <attribute name="optional" value="true"/>
            <attribute name="maven.pomderived" value="true"/>
        </attributes>
    </classpathentry>
    <classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
        <attributes>
            <attribute name="maven.pomderived" value="true"/>
        </attributes>
    </classpathentry>
    <classpathentry excluding="**" kind="src" output="target/classes" path="src/main/webapp">
        <attributes>
            <attribute name="maven.pomderived" value="true"/>
        </attributes>
    </classpathentry>
    <classpathentry kind="src" output="target/test-classes" path="src/test/java">
        <attributes>
            <attribute name="optional" value="true"/>
            <attribute name="maven.pomderived" value="true"/>
            <attribute name="test" value="true"/>
        </attributes>
    </classpathentry>
    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
        <attributes>
            <attribute name="maven.pomderived" value="true"/>
        </attributes>
    </classpathentry>
    <classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
        <attributes>
            <attribute name="maven.pomderived" value="true"/>
        </attributes>
    </classpathentry>
    <classpathentry kind="output" path="target/classes"/>
</classpath>
user_43189820

you might want to check your Java 'build path' in the project properties, if the 'source' directory (path) is not properly setup in there, then this will cause this error to occur for all the classes therein.

So the path must specify the 'root' (containing) directory in which the sources within the package exists ...

user_41150520
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