instrumentation - Java agent : transform() not invoked for all classes -


i have simple transformer:

import java.io.bytearrayinputstream; import java.lang.instrument.classfiletransformer; import java.lang.instrument.illegalclassformatexception; import java.security.protectiondomain;  import javassist.classpool; import javassist.ctclass; import javassist.ctmethod;  //this class registered instrumentation agent public class pizzatransformer implements classfiletransformer {      public byte[] transform(classloader loader,                              string classname,                             class classbeingredefined,                             protectiondomain protectiondomain,                             byte[] classfilebuffer) throws      illegalclassformatexception {         byte[] bytecode = classfilebuffer;          system.out.println("this class  "+classname);          return bytecode;         } }

the agent code follows:

import java.lang.instrument.instrumentation;  public class pizzaagent {     public static void premain(string agentargs, instrumentation inst) {         system.out.println("executing premain.........");         inst.addtransformer(new pizzatransformer(),true);     } }

the manifest :

boot-class-path: javassist.jar

premain-class: pizzaagent

can-redefine-classes: true

can-retransform-classes: true

what puzzling 4000+ classes printed transform(), when 19000+ classes reported loaded turning on -verbose:class command line launching.

why more 10000 classes not invoking transform()?

thank you

you seeing classes not yet loaded when agent attached. if want handle loaded classes, too, have explicitly retransform these classes. can by:

instrumentation.retransformclasses(instrumentation.getloadedclasses());

however, classes not retransformable (instrumentation::ismodifiable) , need split array avoid draining memory.


Comments

Post a Comment

Popular posts from this blog

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m
Read more

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more