CODEWITHSUNDEEP
javapool
TeNNoX
TeNNoX

Reputation: 2073

java.lang.ClassFormatError: Invalid constant pool index 63

I tried to extract a .class File from the .jar, and it worked, but then I changed something an now i got this error:

java.lang.ClassFormatError: Invalid constant pool index 63

Here's my code:

String path = new File(getClass().getProtectionDomain().getCodeSource().getLocation().getFile()).getAbsolutePath();
if (path.endsWith("."))
    path = path.substring(0, path.length() - 1);
String decodedPath = URLDecoder.decode(path, "UTF-8");

File file = new File(decodedPath + (decodedPath.endsWith("\\") ? "Classfile.class" : "\\Classfile.class"));

InputStreamReader read = new InputStreamReader(FileSync.class.getResourceAsStream("/Classfile.class"));
FileWriter write = new FileWriter(file);

int c;
while ((i = read.read()) > -1) {
    write.write(i);
}
write.flush();
read.close();
write.close();

ProcessBuilder builder = new ProcessBuilder(System.getProperty("java.home") + "\\bin\\java.exe", "Classfile", decodedPath + (decodedPath.endsWith("\\") ? "Program.jar" : "\\Program.jar"));
builder.directory(file.getParentFile());
Process process = builder.start();

Can anyone help?

Upvotes: 2

Views: 10539

Answers (1)

Bimalesh Jha
Bimalesh Jha

Reputation: 1504

InputStreamReader and FileWriter does implicit bytes <-> char conversion. Since java class files are binary files, use the raw bytes via FileInputStream and FileOutputStream.

Probably, you can use a hex editor and open the class files before and after writing to verify what is missing/added in the new class file.

Upvotes: 3

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