debugging - How can I get the bytecodes that are executed at runtime for a Java program? -

-

the compiled .class file contains bytecodes corresponding whole java class. however, during execution, bytecodes exectued multiple times while not executed @ all, depending on logic , input. there way trace of bytecodes executed during lifetime of java program?

edit: use case

i think use-case may help. after sample run of program, count frequency of bytecode instructions executed (e.g. areturn has been carried out 10 times). there profiler or other tool can use purpose?

this obscure paper talks such tool

http://ccsl.icmc.usp.br/files/vincenzi-et-al-2003.pdf

it's quite old (2003)

it states

this paper describes coverage testing tool java programs , java-based components, named jabuti (java bytecode understanding , testing). differently other testing tools require java source code carry out program analysis, instrumentation , coverage assessment, our tool requires java bytecode. bytecode can viewed assembly-like language retains high-level information program [lindholm , yellin, 1999 ]. therefore, jabuti enables user test java programs , java-based components when no source code available. there others testing tools work @ bytecode level. frame work junit [beck , gamma, 2002 ], instance, can used test java bytecode, enables performing black-box testing; not report coverage information. jtest [corporation, 2002] , glassjar [edge, 2002 ] provide coverage information respect control-flow testing criteria @ bytecode level, none of them supports dataflow coverage testing criteria. working @ bytecode level want provide tool can used testing not java applications have corresponding source code available, also, ones have bytecode, software components


Comments

Post a Comment

Popular posts from this blog

python - Subclassed QStyledItemDelegate ignores Stylesheet -

-
i'm trying subclass qstyleditemdelegate remove focus rectangle in qcombobox . even though i'm calling base implementation of paint function , nothing else, result different. looks if parts of style-sheet influence bounding box of item taken consideration. class pstyleditemdelegate(qstyleditemdelegate): def __init__(self, *args, **kwds): super(pstyleditemdelegate, self).__init__(*args, **kwds) def paint(self, *args, **kwargs): qstyleditemdelegate.paint(*args, **kwargs) what have paint unmodified qstyleditemdelegate ? as suggested tried replacing pyside pyqt4 , works, appears bug. update pyside 1.1.2 1.2.1 result same. unfortunately switch breaks other parts of code, if there no other suggestions i'm going accept answer. edit bug tracked here
Read more

java - HttpClient 3.1 Connection pooling vs HttpClient 4.3.2 -

-
i have used httpclient3.1(java) connection pooling below : import org.apache.commons.httpclient.httpclient; import org.apache.commons.httpclient.multithreadedhttpconnectionmanager; import org.apache.commons.httpclient.params.httpclientparams; import org.apache.commons.httpclient.params.httpmethodparams; import org.apache.log4j.logger; public class httpclientmanager { private static logger logger = logger.getlogger(httpclientmanager.class); private static multithreadedhttpconnectionmanager connectionmanager = new multithreadedhttpconnectionmanager(); private static httpclientparams clientparams = new httpclientparams(); static { try { clientparams.makelenient(); clientparams.setauthenticationpreemptive(false); clientparams.setparameter(httpmethodparams.so_timeout, new integer(30000)); // set so_timeout clientparams.setparameter(httpmethodparams.head_body_check_timeout, new integer(3000)); // head responses
Read more

SQL: Divide the sum of values in one table with the count of rows in another -

-
is possible to, in single query, sum bunch of values in 1 table, , divide count of rows in another? there common id/key in both tables... fyi, win points least info provided in question. answer it's possible...here psuedo code since i'm guessing @ tables , columns select summing / counting whynot (select id, sum(whatever) summing where_ever ) inner join (select id, count(1) counting what_ever)b on a.id = b.id question = 'vague' group a.id
Read more