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I know nothing about java, but decided to give it a try since I crash frequently in SMP. It also gives errors when recompiling the file.

I extracted minecraft.jar with 7zip into E:\temp, and then downloaded and put jad.exe into that folder. I also installed jdk.

"jad -s java ii.class" gives:

Parsing ii.class... Generating ii.java
Overlapped try statements detected. Not all exception handlers will be resolved
in the method a
Overlapped try statements detected. Not all exception handlers will be resolved
in the method b

This generated ii.java, in which I commented out line 28.

In jdk\bin I typed "javac e:\temp\ii.java" and received the following error message:

C:\Program Files\Java\jdk1.6.0_21\bin>javac e:\temp\ii.java
e:\temp\ii.java:13: cannot find symbol
symbol  : class lb
location: class ii
    public ii(Socket socket, String s1, lb lb1)
                                        ^
e:\temp\ii.java:37: cannot find symbol
symbol  : class fn
location: class ii
    public void a(fn fn1)
                  ^
e:\temp\ii.java:199: cannot find symbol
symbol  : class lb
location: class ii
    private lb l;
            ^
e:\temp\ii.java:31: cannot find symbol
symbol  : class ni
location: class ii
        o = new ni(this, (new StringBuilder()).append(s1).append(" read thread")
.toString());
                ^
e:\temp\ii.java:32: cannot find symbol
symbol  : class nk
location: class ii
        n = new nk(this, (new StringBuilder()).append(s1).append(" write thread"
).toString());
                ^
e:\temp\ii.java:43: operator + cannot be applied to fn.a,int
            s += fn1.a() + 1;
                      ^
e:\temp\ii.java:43: inconvertible types
found   : <nulltype>
required: int
            s += fn1.a() + 1;
                         ^
e:\temp\ii.java:59: cannot find symbol
symbol  : class fn
location: class ii
                fn fn1;
                ^
e:\temp\ii.java:62: cannot find symbol
symbol  : class fn
location: class ii
                    fn1 = (fn)j.remove(0);
                           ^
e:\temp\ii.java:63: operator + cannot be applied to fn.a,int
                    s -= fn1.a() + 1;
                              ^
e:\temp\ii.java:63: operator - cannot be applied to int,<nulltype>
                    s -= fn1.a() + 1;
                      ^
e:\temp\ii.java:65: cannot find symbol
symbol  : variable fn
location: class ii
                fn.a(fn1, g);
                ^
e:\temp\ii.java:70: cannot find symbol
symbol  : class fn
location: class ii
                fn fn2;
                ^
e:\temp\ii.java:73: cannot find symbol
symbol  : class fn
location: class ii
                    fn2 = (fn)k.remove(0);
                           ^
e:\temp\ii.java:74: operator + cannot be applied to fn.a,int
                    s -= fn2.a() + 1;
                              ^
e:\temp\ii.java:74: operator - cannot be applied to int,<nulltype>
                    s -= fn2.a() + 1;
                      ^
e:\temp\ii.java:76: cannot find symbol
symbol  : variable fn
location: class ii
                fn.a(fn2, g);
                ^
e:\temp\ii.java:94: cannot find symbol
symbol  : class fn
location: class ii
            fn fn1 = fn.b(f);
            ^
e:\temp\ii.java:94: cannot find symbol
symbol  : variable fn
location: class ii
            fn fn1 = fn.b(f);
                     ^
e:\temp\ii.java:119: cannot find symbol
symbol  : class nh
location: class ii
        (new nh(this)).start();
             ^
e:\temp\ii.java:150: cannot find symbol
symbol  : class fn
location: class ii
        fn fn1;
        ^
e:\temp\ii.java:152: cannot find symbol
symbol  : class fn
location: class ii
            fn1 = (fn)i.remove(0);
                   ^
Note: e:\temp\ii.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
22 errors

Any idea what I did wrong?