error in running java program in windows cmd

Question

I am facing an error when run the below java program on windows command prompt. Basically, I am a C/C++ programmer , but i need to run a java file as a part of some testing..

Following is the content of my TestClass.java, not copied full code as it looks like some kind of path or package issue.

package parse_signature;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
public class TestClass {
    public static void main(String[] args) throws IOException {
    String path_of_file= "input/content.txt";
    BufferedReader reader = new BufferedReader(new FileReader(path_of_file));
    String line;
    while ((line = reader.readLine()) != null) {
    ....
    }
}

I am in the directory: C:/Users/Desktop/JavaPRGs/Test/, when i used the command javac TestClass.java,

TestClass.class got created and when i run java TestClass

I get following error:

Error: Could not find or load main class TestClass
Caused by: java.lang.NoClassDefFoundError: parse_signature/TestClass (wrong name: TestClass)

I tried going back to previous directory C:/Users/Desktop/JavaPRGs and ran java Test.TestClass got the same error (only this difference wrong name: Test/TestClass)

Also tried follwing, but the result is same.

C:\Program Files\Java\jdk-12.0.1\java -cp . Test.TestClass

can you put your source code online so i can replicate it? here's a tutorial: beginnersbook.com/2013/05/first-java-program — doppelgunner
– doppelgunner, Commented Jun 19, 2020 at 8:36
your class is in a package, are you keeping that in mind? also: why is your main method throwing an Exception? you want your application to crash? — Stultuske
– Stultuske, Commented Jun 19, 2020 at 8:36
@doppelgunner no, everything that's needed to reproduce the problem should be in the question. — Federico klez Culloca
– Federico klez Culloca, Commented Jun 19, 2020 at 8:37
Java expects the package to be part of the path to the class file. — Powerlord
– Powerlord, Commented Jun 19, 2020 at 8:44
docs.oracle.com/javase/tutorial/java/package/managingfiles.html — dave_thompson_085
– dave_thompson_085, Commented Jun 19, 2020 at 11:12

doppelgunner · Accepted Answer · 2020-06-19 08:39:13Z

1

You need to remove the package and try to compile and run it again using javac TestClass.java and java TestClass

answered Jun 19, 2020 at 8:39

doppelgunner

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3 Comments

csavvy Over a year ago

sorry for late reply, the sample program (Hello World) i have already tried that is working fine, because it does not include any packages, in your second comment you mentioned to remove the package , i have removed , now this time the error is removed, but i dont get any output, i have updated the code with few more lines, plz guide me

user7655213 Over a year ago

@sravs, the code snippet you shared does not actually have any output instructions so of course it won't output anything.

csavvy Over a year ago

@Taschi, actually that part i have not pasted , i was referring to my code, anyway the solution for the problem is solved by both doppelgunner and dave

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