If you don't have the classpath file or project file setup do this.
Create a new file called .classpath
In orange where ever your source folder is located.
In red is your libraries, make sure to change those to yours.
In green is where ever you want your binary files to go when eclipse compiles.
Code:
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
<classpathentry kind="lib" path="lib/synthetica.jar"/>
<classpathentry kind="lib" path="lib/jl1.0.1.jar"/>
<classpathentry kind="lib" path="lib/asm-5.0.2.jar"/>
<classpathentry kind="lib" path="lib/syntheticaBlackEye.jar"/>
<classpathentry kind="lib" path="lib/substance-5.3.jar"/>
<classpathentry kind="con" path="org.eclipse.jdt.USER_LIBRARY/lib"/>
<classpathentry kind="output" path="class"/>
</classpath>
Now create a new file called .project
You probably wont have to change anything besides the name.
Code:
<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>Project Wind Client</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
</natures>
</projectDescription>
Make sure those files are located in your client next to your source folder.