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< a href = "https://github.com/alibaba/arthas/blob/master/site/src/site/sphinx/en/redefine.md" class = "fa fa-github" > Edit on GitHub< / a >
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< div class = "section" id = "redefine" >
< span id = "redefine" > < / span > < h1 > redefine< a class = "headerlink" href = "#redefine" title = "Permalink to this headline" > ¶< / a > < / h1 >
< blockquote >
< div > Load the external < tt class = "docutils literal" > *.class< / tt > files to re-define the loaded peer class in JVM.< / div > < / blockquote >
< p > Reference: < a class = "reference external" href = "https://docs.oracle.com/javase/8/docs/api/java/lang/instrument/Instrumentation.html#redefineClasses-java.lang.instrument.ClassDefinition...-" > Instrumentation#redefineClasses< / a > < / p >
< blockquote >
< div > Notes: Re-defined classes cannot be restored. There are chances that redefining may fail due to some reasons, for example: there’ ’ < / div > < / blockquote >
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< span id = "options" > < / span > < h2 > Options< a class = "headerlink" href = "#options" title = "Permalink to this headline" > ¶< / a > < / h2 >
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< th align = "right" > Name< / th >
< th align = "left" > Specification< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td align = "right" > < code > [c:]< / code > < / td >
< td align = "left" > hashcode of the class loader< / td >
< / tr >
< tr >
< td align = "right" > < code > [p:]< / code > < / td >
< td align = "left" > absolute path of the external < code > *.class< / code > , multiple paths are separated with 'space'< / td >
< / tr >
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< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > redefine -p /tmp/Test.class
redefine -c 327a647b -p /tmp/Test.class /tmp/Test$Inner.class
< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "restrictions-of-the-redefine-command" >
< span id = "restrictions-of-the-redefine-command" > < / span > < h2 > Restrictions of the redefine command< a class = "headerlink" href = "#restrictions-of-the-redefine-command" title = "Permalink to this headline" > ¶< / a > < / h2 >
< ul >
< li > < p class = "first" > New field/method is not allowed< / p >
< / li >
< li > < p class = "first" > The function that is running, no exit can not take effect, such as the new < tt class = "docutils literal" > System.out.println< / tt > added below, only the < tt class = "docutils literal" > run()< / tt > function will take effect.< / p >
< div class = "highlight-java notranslate" > < div class = "highlight hljs" > < pre class = "java" > public class MathGame {
public static void main(String[] args) throws InterruptedException {
MathGame game = new MathGame();
while (true) {
game.run();
TimeUnit.SECONDS.sleep(1);
// This doesn' t work because the code keeps running in while
System.out.println(" in loop" );
}
}
public void run() throws InterruptedException {
// This works because the run() function ends completely every time
System.out.println(" call run()" );
try {
int number = random.nextInt();
List< Integer> primeFactors = primeFactors(number);
print(number, primeFactors);
} catch (Exception e) {
System.out.println(String.format(" illegalArgumentCount:%3d, " , illegalArgumentCount) + e.getMessage());
}
}
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