problems with Eclipse jar import ( Java.lang.ClassNotFoundException )

[lofty latch]

I downloaded a jar file ( here https://commons.apache.org/proper/commons-text/download_text.cgi)

I imported the jar into the classpath and used a method from it but whenn i compile it i get a Java.lang.ClassNotFoundException
I hvae no idea why this is happening or how to fix it

[winged onyx]

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[pallid zenith]

Apache Commons Text depends on Apache Commons Lang3

so if you plan to use Apache Commons Text, you also need Apache Commons Lang3 in your dependencies/build path/classpath/(referenced) libraries

If you are using a build tool, those would be fetched automatically

[lofty latch]

i don't know how to add maven dependencies to an already existing project so i thought adding the jar manually would be faster an easier

thx for the answer