Java Incompatible magic value 4022320623

Question

Im getting a strange error when im compiling my code on a server and downloading it and trying to run it on my computer.

Im basically compiling some java files on an

Answer 1

If you use Maven te build your project. try to disable resource filtering in maven-war-plugin like that <filtering>false</filtering> in POM file:

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.3</version>
<configuration>
    <webResources>
        <resource>
            <filtering>false</filtering>
            <targetPath>WEB-INF/classes</targetPath>
            <directory>${project.basedir}/target/classes</directory>
        </resource>
    </webResources>
    <filtering>false</filtering>
  </configuration>
</plugin>

Answer 2

Okay i figured it out with thanks to @Asaph mentioning the downloading going wrong..

Basically the downloading was fine, it was the way i was writing the file.

When im downloading projects, im downloading the source and binaries, but i was writing both files as if they were the same.

So changed the code to check the file type and then use the appropriate writer when necessary. If by some miracle someone has the same issue or is doing something similar here is the code:

(Note this was just written 5 second ago to fix the problem and is very poorly written, im about to refactor it myself, but i cant do everything for you)

public void download(String project, String version, String location)
{
    for(S3ObjectSummary s: getObjectList())
    {
        String[] data = s.getKey().split("/");
        if(data[0].equals(project) && data[1].equals(version))
        {
            S3Object object = s3.getObject(s3BucketName,s.getKey());
            InputStream input = object.getObjectContent();

            BufferedReader reader = new BufferedReader(new InputStreamReader(input));

            File file = new File(location +"/"+ data[0] + "/" + data[2] + "/" + data[3] + "/" + data[4]);
            if(!file.exists())
            {
                  try {
                      file.getParentFile().mkdirs();
                        file.createNewFile();
                } catch (IOException e) {

                    e.printStackTrace();
                }
            }
            try 
            {
                if(data[4].endsWith(".java"))
                {
                Writer writer = new OutputStreamWriter(new FileOutputStream(file));
                while (true) {          
                     String line = reader.readLine();           
                     if (line == null)
                          break;            

                     writer.write(line + "\n");
                }

                writer.close();
                }
                else if(data[4].endsWith(".class"))
                {
                    System.out.println("Writing Classes");
                    byte[] buffer = new byte[8 * 1024];

                    try {
                          OutputStream output = new FileOutputStream(file.getAbsolutePath());
                          try {
                            int bytesRead;
                            while ((bytesRead = input.read(buffer)) != -1) {
                              output.write(buffer, 0, bytesRead);
                            }
                          } finally {
                            output.close();
                          }
                        } finally {
                          input.close();
                        }
                }

            } catch (FileNotFoundException e) {

                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }


        }
    }
}

Answer 3

Java is telling you it's not a valid class file because it doesn't begin with the expected byte sequence (0xCAFEBABE). Something went wrong when you downloaded it. Try inspecting your class file in an editor and see if maybe you actually have some other content in there.