code: public byte[] getJarBytes() throws EeClassLoaderException {
          DataInputStream dataInputStream = null;
          byte[] bytes;
  
          try {
              long jarEntrySize = jarEntry.getSize();
              if (jarEntrySize <= 0  ||  jarEntrySize >= Integer.MAX_VALUE) {
                  throw new EeClassLoaderException("Invalid size " + jarEntrySize + " for entry " + jarEntry);
              }
  
              bytes = new byte[(int) jarEntrySize];
  
              InputStream inputStream = jarFileInfo.getJarFile().getInputStream(jarEntry);
              dataInputStream = new DataInputStream(inputStream);
              dataInputStream.readFully(bytes);
          } catch (IOException e) {
              throw new EeClassLoaderException(null, e);
          } finally {
              if (dataInputStream != null) {
                  try {
                      dataInputStream.close();
                  } catch (IOException e) {
                      // Ignore
                  }
              }
          }
  
          return bytes;
      }
docs: Read JAR entry and return byte array of this JAR entry.