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3.0.5-SNAPSHOT
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< li > jad< / li >
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< span id = "jad" > < / span > < h1 > jad< a class = "headerlink" href = "#jad" title = "Permalink to this headline" > ¶< / a > < / h1 >
< p > De-compile specified loaded classes.< / p >
< p > < code class = "docutils literal notranslate" > < span class = "pre" > jad< / span > < / code > helps to < em > de-compile< / em > the byte code in JVM to the source code to assist you to better understand the logic behind.< / p >
< p > F.Y.I< / p >
< ul class = "simple" >
< li > the de-compiled code will be grammatically highlighted for readability in Arthas console;< / li >
< li > there might be some trivial grammar errors but it won’ < / li >
< / ul >
< div class = "section" id = "options" >
< span id = "options" > < / span > < h2 > Options< a class = "headerlink" href = "#options" title = "Permalink to this headline" > ¶< / a > < / h2 >
< table border = "1" class = "docutils" >
< thead >
< tr >
< th align = "right" > Name< / th >
< th align = "left" > Specification< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td align = "right" > < em > class-pattern< / em > < / td >
< td align = "left" > pattern for the class name< / td >
< / tr >
< tr >
< td align = "right" > [c:]< / td >
< td align = "left" > hashcode of the class loader that loaded the class< / td >
< / tr >
< tr >
< td align = "right" > [E]< / td >
< td align = "left" > turn on regex matching while the default is wildcard matching< / td >
< / tr >
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< span id = "usage" > < / span > < h2 > Usage< a class = "headerlink" href = "#usage" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > When several class loaders loaded the same class:< / p >
< ol class = "simple" >
< li > < code class = "docutils literal notranslate" > < span class = "pre" > jad< / span > < / code > to get the hashcode of the class loader;< / li >
< li > < code class = "docutils literal notranslate" > < span class = "pre" > jad< / span > < span class = "pre" > -c< / span > < span class = "pre" > < hashcode> < / span > < / code > to get the de-compiled class loaded by the specified class loader.< / li >
< / ol >
< div class = "highlight-java notranslate" > < div class = "highlight" > < pre > < span > < / span > $ jad org.apache.log4j.Logger
Found more than one class for: org.apache.log4j.Logger, Please use jad -c hashcode org.apache.log4j.Logger
HASHCODE CLASSLOADER
69dcaba4 +-monitor' s ModuleClassLoader
6e51ad67 +-java.net.URLClassLoader@6e51ad67
+-sun.misc.Launcher$AppClassLoader@6951a712
+-sun.misc.Launcher$ExtClassLoader@6fafc4c2
2bdd9114 +-pandora-qos-service' s ModuleClassLoader
4c0df5f8 +-pandora-framework' s ModuleClassLoader
Affect(row-cnt:0) cost in 38 ms.
$ jad org.apache.log4j.Logger -c 69dcaba4
ClassLoader:
+-monitor' s ModuleClassLoader
Location:
/Users/zhuyong/Downloads/taobao-hsf.sar/plugins/monitor/lib/log4j-1.2.14.jar
package org.apache.log4j;
import org.apache.log4j.spi.*;
public class Logger extends Category
{
private static final String FQCN;
protected Logger(String name)
{
super(name);
}
public static Logger getLogger(String name)
{
return LogManager.getLogger(name);
}
public static Logger getLogger(Class clazz)
{
return LogManager.getLogger(clazz.getName());
}
public static Logger getRootLogger()
{
return LogManager.getRootLogger();
}
public static Logger getLogger(String name, LoggerFactory factory)
{
return LogManager.getLogger(name, factory);
}
public void trace(Object message)
{
if (repository.isDisabled(5000))
{
return;
}
if (Level.TRACE.isGreaterOrEqual(getEffectiveLevel()))
{
forcedLog(Logger.FQCN, Level.TRACE, message, null);
}
}
public void trace(Object message, Throwable t)
{
if (repository.isDisabled(5000))
{
return;
}
if (Level.TRACE.isGreaterOrEqual(getEffectiveLevel()))
{
forcedLog(Logger.FQCN, Level.TRACE, message, t);
}
}
public boolean isTraceEnabled()
{
if (repository.isDisabled(5000))
{
return false;
}
return Level.TRACE.isGreaterOrEqual(getEffectiveLevel());
}
static
{
Logger.FQCN = Logger.class.getName();
}
}
Affect(row-cnt:1) cost in 190 ms.
< / pre > < / div >
< / div >
< p > De-compile the specified method:< / p >
< div class = "highlight-sh notranslate" > < div class = "highlight" > < pre > < span > < / span > $ jad com.taobao.container.web.arthas.rest.MetricsController directMetrics
ClassLoader:
+-com.taobao.pandora.boot.loader.ReLaunchURLClassLoader@1817d444
+-sun.misc.Launcher< span class = "nv" > $AppClassLoader< / span > @14dad5dc
+-sun.misc.Launcher< span class = "nv" > $ExtClassLoader< / span > @a38d7a3
Location:
/Users/zhuyong/middleware/tomcat-web/tomcat-web-web/target/classes/
private Map< String, Object> directMetrics< span class = "o" > (< / span > String ip, String< span class = "o" > []< / span > metrics< span class = "o" > )< / span > < span class = "o" > {< / span >
JSONObject obj< span class = "p" > ;< / span >
HashMap< String, Object> < span class = "nv" > result< / span > < span class = "o" > =< / span > new HashMap< String, Object> < span class = "o" > ()< / span > < span class = "p" > ;< / span >
result.put< span class = "o" > (< / span > < span class = "s2" > " success" < / span > , < span class = "nb" > false< / span > < span class = "o" > )< / span > < span class = "p" > ;< / span >
String < span class = "nv" > metricUrl< / span > < span class = "o" > =< / span > < span class = "s2" > " http://" < / span > + ip + < span class = "s2" > " :8006/metrics/specific" < / span > < span class = "p" > ;< / span >
String < span class = "nv" > postBody< / span > < span class = "o" > =< / span > Arrays.stream< span class = "o" > (< / span > metrics< span class = "o" > )< / span > .map< span class = "o" > (< / span > metric -> < span class = "s2" > " metric=" < / span > + metric< span class = "o" > )< / span > .collect< span class = "o" > (< / span > Collectors.joining< span class = "o" > (< / span > < span class = "s2" > " & " < / span > < span class = "o" > ))< / span > < span class = "p" > ;< / span >
HttpClientUtils.Response < span class = "nv" > resp< / span > < span class = "o" > =< / span > HttpClientUtils.sendPostRequest< span class = "o" > ((< / span > String< span class = "o" > )< / span > metricUrl, < span class = "o" > (< / span > String< span class = "o" > )< / span > postBody< span class = "o" > )< / span > < span class = "p" > ;< / span >
< span class = "k" > if< / span > < span class = "o" > (< / span > resp.isSuccess< span class = "o" > ()< / span > < span class = "o" > & & < / span > < span class = "o" > (< / span > < span class = "nv" > obj< / span > < span class = "o" > =< / span > JSON.parseObject< span class = "o" > (< / span > resp.getContent< span class = "o" > ()))< / span > .containsKey< span class = "o" > (< / span > < span class = "s2" > " success" < / span > < span class = "o" > )< / span > < span class = "o" > & & < / span > obj.getBoolean< span class = "o" > (< / span > < span class = "s2" > " success" < / span > < span class = "o" > )< / span > .booleanValue< span class = "o" > ()< / span > < span class = "o" > & & < / span > obj.containsKey< span class = "o" > (< / span > < span class = "s2" > " data" < / span > < span class = "o" > ))< / span > < span class = "o" > {< / span >
JSONArray < span class = "nv" > dataArray< / span > < span class = "o" > =< / span > obj.getJSONArray< span class = "o" > (< / span > < span class = "s2" > " data" < / span > < span class = "o" > )< / span > < span class = "p" > ;< / span >
HashMap< String, Object> < span class = "nv" > metricMap< / span > < span class = "o" > =< / span > new HashMap< String, Object> < span class = "o" > ()< / span > < span class = "p" > ;< / span >
< span class = "k" > for< / span > < span class = "o" > (< / span > Object aDataArray : dataArray< span class = "o" > )< / span > < span class = "o" > {< / span >
JSONObject < span class = "nv" > o< / span > < span class = "o" > =< / span > < span class = "o" > (< / span > JSONObject< span class = "o" > )< / span > aDataArray< span class = "p" > ;< / span >
metricMap.put< span class = "o" > (< / span > o.getString< span class = "o" > (< / span > < span class = "s2" > " metric" < / span > < span class = "o" > )< / span > , o.get< span class = "o" > (< / span > < span class = "s2" > " value" < / span > < span class = "o" > ))< / span > < span class = "p" > ;< / span >
< span class = "o" > }< / span >
result.put< span class = "o" > (< / span > < span class = "s2" > " data" < / span > , metricMap< span class = "o" > )< / span > < span class = "p" > ;< / span >
result.put< span class = "o" > (< / span > < span class = "s2" > " success" < / span > , < span class = "nb" > true< / span > < span class = "o" > )< / span > < span class = "p" > ;< / span >
< span class = "k" > return< / span > result< span class = "p" > ;< / span >
< span class = "o" > }< / span >
< span class = "k" > return< / span > result< span class = "p" > ;< / span >
< span class = "o" > }< / span >
Affect< span class = "o" > (< / span > row-cnt:1< span class = "o" > )< / span > cost in < span class = "m" > 1508< / span > ms.
< / pre > < / div >
< / div >
< p > F.Y.I< / p >
< p > Inner class is not yet supported, you can just check the < em > outer< / em > class to further check the inner class.< / p >
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