Question

I once wrote this line in a Java class. This compiled fine in Eclipse but not on the command line.

This is on

• Eclipse 3.3
• JDK 1.5
• Windows XP Professional

Any clues?

Error given on the command line is:

Icons.java:16: code too large             public static final byte[] compileIcon = { 71, 73, 70, 56, 57, 97, 50,                                        ^ 

The code line in question is:

public static final byte[] compileIcon = { 71, 73, 70, 56, 57, 97, 50,             0, 50, 0, -9, 0, 0, -1, -1, -1, -24, -72, -72, -24, -64, -64,             -8, -16, -24, -8, -24, -24, -16, -24, -32, -1, -8, -8, 48, 72,             -72, -24, -80, -80, 72, 96, -40, -24, -24, -8, 56, 88, -56,             -24, -40, -48, -24, -48, -64, 56, 80, -64, 64, 88, -48, -56,             -64, -64, -16, -24, -24, -32, -40, -40, -32, -88, -96, -72,             -72, -72, -48, -56, -56, -24, -32, -32, -8, -8, -1, -24, -40,             -56, -64, -72, -72, -16, -32, -40, 48, 80, -72, -40, -96, -104,             -40, -96, -96, -56, -104, -104, 120, 88, -104, -40, -64, -80,             -32, -88, -88, -32, -56, -72, -72, -80, -80, -32, -80, -88,             104, -96, -1, -40, -40, -40, -64, -104, -104, -32, -56, -64,             -112, 104, 112, -48, -104, -112, -128, -112, -24, -72, -80,             -88, -8, -8, -8, -64, -112, -120, 72, 104, -40, 120, 96, -96,             -112, -96, -24, -112, -120, -72, 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Answer 1

Taking from this forum on Sun’s support site, no method can be more than 64 KB long:

When you have code (pseudo) like the following…

class MyClass {   private String[] s = { 'a', 'b', 'c'}    public MyClass()   {   } 

The compiler ends up producing code that basically looks like the following.

class MyClass {   private String[] s;    private void FunnyName$Method()   {     s[0] = 'a';     s[1] = 'b';     s[2] = 'c';   }   public MyClass()   {     FunnyName$Method();   } 

And as noted java limits all methods to 64k, even the ones the compiler creates.

It may be that Eclipse is doing something sneaky to get around this, but I assure you this is still possible in Eclipse because I have seen the same error message. A better solution is to just read from a static file, like this:

public class Icons {   public static final byte[] compileIcon;   static   {     compileIcon = readFileToBytes('compileIcon.gif');   }   //... (I assume there are several other icons)   private static byte[] readFileToBytes(String filename)   {     try {       File file = new File(filename);       byte[] bytes = new byte[(int)file.length()];       FileInputStream fin = new FileInputStream(file);       fin.read(bytes);       fin.close();     }     catch (Exception e) {       e.printStackTrace();       System.exit(1);     }   } }