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redefine < span class = "token parameter variable" > -c< / span > 327a647b /tmp/Test.class /tmp/Test< span class = "token punctuation" > \< / span > < span class = "token variable" > $Inner< / span > .class
redefine < span class = "token parameter variable" > --classLoaderClass< / span > sun.misc.Launcher< span class = "token variable" > $AppClassLoader< / span > /tmp/Test.class /tmp/Test< span class = "token punctuation" > \< / span > < span class = "token variable" > $Inner< / span > .class
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "use-with-the-jad-mc-command" tabindex = "-1" > < a class = "header-anchor" href = "#use-with-the-jad-mc-command" aria-hidden = "true" > #< / a > Use with the jad/mc command< / h2 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > jad --source-only com.example.demo.arthas.user.UserController < span class = "token operator" > > < / span > /tmp/UserController.java
< span class = "token function" > mc< / span > /tmp/UserController.java < span class = "token parameter variable" > -d< / span > /tmp
redefine /tmp/com/example/demo/arthas/user/UserController.class
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < ul > < li > Use < code > jad< / code > command to decompile bytecode, and then you can use other editors, such as vim to modify the source code.< / li > < li > < code > mc< / code > command to compile the modified code< / li > < li > Load new bytecode with < code > redefine< / code > command< / li > < / ul > < h2 id = "tips-for-uploading-class-files-to-the-server" tabindex = "-1" > < a class = "header-anchor" href = "#tips-for-uploading-class-files-to-the-server" aria-hidden = "true" > #< / a > Tips for uploading .class files to the server< / h2 > < p > The < code > mc< / code > command may fail. You can modify the code locally, compile it, and upload it to the server. Some servers do not allow direct uploading files, you can use the < code > base64< / code > command to bypass.< / p > < ol > < li > < p > Convert the < code > .class< / code > file to base64 first, then save it as result.txt< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > Base64 < span class = "token operator" > < < / span > Test.class < span class = "token operator" > > < / span > result.txt
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < / li > < li > < p > Login the server, create and edit < code > result.txt< / code > , copy the local content, paste and save< / p > < / li > < li > < p > Restore < code > result.txt< / code > on the server to < code > .class< / code > < / p > < div class = "language-text ext-text line-numbers-mode" > < pre class = "language-text" > < code > Base64 -d < result.txt > Test.class
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < / li > < li > < p > Use the md5 command to verify that the < code > .class< / code > files are consistent.< / p > < / li > < / ol > < h2 id = "restrictions-of-the-redefine-command" tabindex = "-1" > < a class = "header-anchor" href = "#restrictions-of-the-redefine-command" aria-hidden = "true" > #< / a > Restrictions of the redefine command< / h2 > < ul > < li > New field/method is not allowed< / li > < li > The function that is running, no exit can not take effect, such as the new < code > System.out.println< / code > added below, only the < code > run()< / code > function will take effect.< / li > < / ul > < div class = "language-java ext-java line-numbers-mode" > < pre class = "language-java" > < code > < span class = "token keyword" > public< / span > < span class = "token keyword" > class< / span > < span class = "token class-name" > MathGame< / span > < span class = "token punctuation" > {< / span >
< span class = "token keyword" > public< / span > < span class = "token keyword" > static< / span > < span class = "token keyword" > void< / span > < span class = "token function" > main< / span > < span class = "token punctuation" > (< / span > < span class = "token class-name" > String< / span > < span class = "token punctuation" > [< / span > < span class = "token punctuation" > ]< / span > args< span class = "token punctuation" > )< / span > < span class = "token keyword" > throws< / span > < span class = "token class-name" > InterruptedException< / span > < span class = "token punctuation" > {< / span >
< span class = "token class-name" > MathGame< / span > game < span class = "token operator" > =< / span > < span class = "token keyword" > new< / span > < span class = "token class-name" > MathGame< / span > < span class = "token punctuation" > (< / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token keyword" > while< / span > < span class = "token punctuation" > (< / span > < span class = "token boolean" > true< / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > {< / span >
game< span class = "token punctuation" > .< / span > < span class = "token function" > run< / span > < span class = "token punctuation" > (< / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token class-name" > TimeUnit< / span > < span class = "token punctuation" > .< / span > < span class = "token constant" > SECONDS< / span > < span class = "token punctuation" > .< / span > < span class = "token function" > sleep< / span > < span class = "token punctuation" > (< / span > < span class = "token number" > 1< / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token comment" > // This doesn' t work because the code keeps running in while< / span >
< span class = "token class-name" > System< / span > < span class = "token punctuation" > .< / span > out< span class = "token punctuation" > .< / span > < span class = "token function" > println< / span > < span class = "token punctuation" > (< / span > < span class = "token string" > " in loop" < / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token punctuation" > }< / span >
< span class = "token punctuation" > }< / span >
< span class = "token keyword" > public< / span > < span class = "token keyword" > void< / span > < span class = "token function" > run< / span > < span class = "token punctuation" > (< / span > < span class = "token punctuation" > )< / span > < span class = "token keyword" > throws< / span > < span class = "token class-name" > InterruptedException< / span > < span class = "token punctuation" > {< / span >
< span class = "token comment" > // This works because the run() function ends completely every time< / span >
< span class = "token class-name" > System< / span > < span class = "token punctuation" > .< / span > out< span class = "token punctuation" > .< / span > < span class = "token function" > println< / span > < span class = "token punctuation" > (< / span > < span class = "token string" > " call run()" < / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token keyword" > try< / span > < span class = "token punctuation" > {< / span >
< span class = "token keyword" > int< / span > number < span class = "token operator" > =< / span > random< span class = "token punctuation" > .< / span > < span class = "token function" > nextInt< / span > < span class = "token punctuation" > (< / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token class-name" > List< / span > < span class = "token generics" > < span class = "token punctuation" > < < / span > < span class = "token class-name" > Integer< / span > < span class = "token punctuation" > > < / span > < / span > primeFactors < span class = "token operator" > =< / span > < span class = "token function" > primeFactors< / span > < span class = "token punctuation" > (< / span > number< span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token function" > print< / span > < span class = "token punctuation" > (< / span > number< span class = "token punctuation" > ,< / span > primeFactors< span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token punctuation" > }< / span > < span class = "token keyword" > catch< / span > < span class = "token punctuation" > (< / span > < span class = "token class-name" > Exception< / span > e< span class = "token punctuation" > )< / span > < span class = "token punctuation" > {< / span >
< span class = "token class-name" > System< / span > < span class = "token punctuation" > .< / span > out< span class = "token punctuation" > .< / span > < span class = "token function" > println< / span > < span class = "token punctuation" > (< / span > < span class = "token class-name" > String< / span > < span class = "token punctuation" > .< / span > < span class = "token function" > format< / span > < span class = "token punctuation" > (< / span > < span class = "token string" > " illegalArgumentCount:%3d, " < / span > < span class = "token punctuation" > ,< / span > illegalArgumentCount< span class = "token punctuation" > )< / span > < span class = "token operator" > +< / span > e< span class = "token punctuation" > .< / span > < span class = "token function" > getMessage< / span > < span class = "token punctuation" > (< / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > )< / span > < span class = "token punctuation" > ;< / span >
< span class = "token punctuation" > }< / span >
< span class = "token punctuation" > }< / span >
< span class = "token punctuation" > }< / span >
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