Eclipse Version: Helios Service Release 1 Build id: 20100917-0705
eclipse-jee-helios-SR1-win32.zip
Java
JDK
OS: Windows 8.1 Pro N x64
Java JDK, JRE:
Version 8 update 73 ( build 1.8.0_73-b02 )
Both User/System JRE:
C:\Program Files\Java\jre1.8.0_73\bin\javaw.exe
Platform Product
1.8 1.8.0_73 http://java.sun.com/products/autodl/j2se C:\Program Files\Java\jre1.8.0_73\bin\javaw.exe true
file:///C:/WTK2.5.2_01/index.html
http://www.vogella.com/tutorials/EclipseDebugging/article.html
https://help.eclipse.org/mars/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2Freference%2Fbreakpoints%2Fref-uncaught_option.htm
Terminated exit value -...
cmd /c emulator.exe -Xdebug -Xrunjdwp:transport=dt_socket,suspend=y,server=y,address=46417 -classpath C:\Users\Admin\AppData\Local\Temp\_eclipseme.tmpAdmin\ArchAngel8265968564617921586.launch\ArchAngel.jar -Xdevice:DefaultColorPhone -Xdescriptor:C:\Users\Admin\AppData\Local\Temp\_eclipseme.tmpAdmin\ArchAngel8265968564617921586.launch\ArchAngel.jad ArchAngel
Enter %temp% to clean temp data. Restart Eclipse to avoid terminated Emulator.
Or use Java Control Pannel
http://www.adam-bien.com/roller/abien/entry/what_are_the_options_of
https://stackoverflow.com/questions/30736498/why-eclipse-debugger-does-not-stop-on-scoped-exception-breakpoint-how-to-stop-o
https://en.wikipedia.org/wiki/MIDlet
Install JavaMe for Eclipse
http://eclipseme.org/docs/installEclipseME.html
https://www.rose-hulman.edu/class/csse/resources/csmobilegames/softwareInstallation/Eclipse/eclipse-j2me-configuration.html
https://docs.oracle.com/javame/config/cldc/rel/3.3/win/gs/html/getstart_win32/setup_eclipseenv.htm
Be careful with Eclipse debug break points.
It seem that when set too many break point could break Eclipse and it refuse to stop / break on line as expected.
Case study 4 class b AA d e with about 30 or more break point.
After remove all break point then re add them then it work again.
J2ME has some override functions like run() paint() keyPressed(). These functions are longest (often) and most important and loop used most.
We can separate to many other funtions and then call it from paint(), run() ... But the base and skeleton / Thread / Main loop of App is based on these function.
So we should follow these function flow to debug App. Just like when we debug thread, flow of application in LibGDX or other thread.
The boredom of infinite boring loop hole vs always exceptions fire.
After a countless of exception metal rain firing, I encounter other loop hole boredom, now I wish I have an exception in the past :)
Deobfuscator
https://stackoverflow.com/questions/40442942/java-deobfuscator-supporting-variable-renaming
Eclipse disable Validation and Error Annotation
https://stackoverflow.com/questions/17037403/make-eclipse-ignore-all-errors-in-current-project
Sometime JAVA code that extracted/decompiled from JAR, .class file is obfuscated and very hard to read and re-compile. There are many optimized code for example variable declare reduce, operator nested precedence ...
So there is somehow a way that original developer compile these optimized program. Can we recompile these program without error ? By configure compiler and / or IDE to match some point ?
After try config Eclipse to ignore error notice, Validation ... It seem that I can not re-compile obfuscated one.
So I have to back to previous solution is that make some change (to pass Eclipse/JAVA validation) before re-compile it.
This is a tedious task because of so many work have to do to make sure modified program is same as obfuscated. Many mathematical precedence order, variable declare, error index OutOfBound or NullPointer ... appear.
http://www.eclipse.org/community/eclipse_newsletter/2013/october/article2.php
Debugging highly complex applications.
Step-Into-Selection
One of the pain points when debugging non-trivial applications is the difficulty of stepping into a method (or function) when multiple methods are on the same line. Imagine that the execution of the program is currently interrupted at the following line:
result = subtract( multiply( add( a, b ), 3 ), 5 ); // line 20
C:\WTK2.5.2_01\lib
All J2ME class lib place here. We can use jar viewer liek jd-gui to view source code. These standard lib is well developed, It may be useful not only core lib but also the convention, business logic and how to build a java lib.
J2ME 3.0 Can old java game run on this new SDK ? as previous 2.5.x SDK.
http://www.oracle.com/technetwork/java/embedded/javame/javame-sdk/downloads/java-me-sdk-3-0-1849684.html
Working with obfuscated code something like hacking other than programming ?
https://github.com/dsasmblr/game-hacking
https://resources.infosecinstitute.com/encrypted-code-reverse-engineering-bypassing-obfuscation/#gref
https://arxiv.org/pdf/1704.02774.pdf
http://findbugs.sourceforge.net/manual/eclipse.html
https://blog.codecentric.de/en/2013/04/again-10-tips-on-java-debugging-with-eclipse/
Compare with app behavior in K-Emulator for inspect missing item like button, text... Sometime button not show but can be clicked:
When I debug this game, no button SKIP show. I just ignore and still click it (LEFT_KEY).
Then it turn to new case that I expected.
>>>>> run exception <<<<<
java.lang.ArrayIndexOutOfBoundsException
at f.a(+83)
at f.c(+27)
at f.a(+12)
at f.a(+62)
at f.g(+38)
at f.a(+23)
at b.j(+1226)
at b.paint(+281)
at javax.microedition.lcdui.Canvas.callPaint(+85)
at javax.microedition.lcdui.Display.repaint(+82)
at javax.microedition.lcdui.Display$DisplayAccessor.repaint(+14)
at javax.microedition.lcdui.Display$DisplayManagerImpl.repaint(+16)
at com.sun.midp.lcdui.DefaultEventHandler.repaintScreenEvent(+24)
at com.sun.midp.lcdui.DefaultEventHandler$QueuedEventHandler.run(+519)
>>>>> run exception <<<<<
Shift byte operatior
https://stackoverflow.com/questions/10910913/how-do-shift-operators-work-in-java
>>>>> run exception <<<<<
java.lang.ArrayIndexOutOfBoundsException
at f.a(+162)
at f.b(+24)
at f.a(+5)
at f.a(+62)
at f.g(+38)
at f.a(+23)
at b.j(+1226)
at b.paint(+281)
The line number of error log is not correct. We only judge it by compare the relative value. For example the f.a() has many value +12 +23 +62 and +162 ... So we can use these value to judge the position of Exception, function() that error occur. From 62 to 162 is a huge change, (100 value) so this a(+162) may be in far bottom of f.java (ab 1700 LOC).
In reality f.a(+162) seem to be at ab line 702.
I think this incorrect line number is not a bug, if it is then not a high priority since it seem quite difficult to get exact location of Exception. There are many thing affected this, compiler is a very complex system software. System software example is OS (gigantic), drivers, compiler etc.
Refactoring tool, learn on the go.
As Refactor book by Martin Fowler, I see some refactor tool in Eclipse IDE and try to understand, using it.
It is important to have some source code that write in J2ME for reference. It very useful in some case that we want to refactor function, variable name etc. These source can be found on internet. I will update some more sample link. One is here:
J2ME API document: https://docs.oracle.com/javame/config/cldc/ref-impl/midp2.0/jsr118/javax/microedition/lcdui/package-summary.html
eclipse-jee-helios-SR1-win32.zip
Java
JDK
OS: Windows 8.1 Pro N x64
Java JDK, JRE:
Version 8 update 73 ( build 1.8.0_73-b02 )
Both User/System JRE:
C:\Program Files\Java\jre1.8.0_73\bin\javaw.exe
Platform Product
1.8 1.8.0_73 http://java.sun.com/products/autodl/j2se C:\Program Files\Java\jre1.8.0_73\bin\javaw.exe true
file:///C:/WTK2.5.2_01/index.html
Welcome to the Sun Java Wireless Toolkit for CLDC. The version 2.5.2 release is available on both Windows and Linux platforms. The product documentation discusses both platforms.
| Sun Java Wireless Toolkit Version 2.5.2_01 for CLDC is a Security Update that corrects vulnerabilities that might allow an untrusted application to execute arbitrary code. This can only happen if you obtain a malicious program and run it in an earlier version of the toolkit. The only change between version 2.5.2_01 and version 2.5.2 is the security update, so references to version 2.5.2 on this page and in the documentation correctly identify the most recent feature release. The version 2.5.2 documentation remains valid. |
The documentation in this release includes the following:
- Release Notes
- Frequently Asked Questions (FAQ)
- Sun Java Wireless Toolkit for CLDC User's Guide [HTML] [PDF]
- This book describes how to use the device emulator, the development toolbar, and specialized components.
- Sun Java Wireless Toolkit for CLDC Basic Customization Guide [HTML] [PDF]
- Read this book to learn how to create new skins for the emulator or perform other basic customizations.
For your convenience, this JavaTM Platform, Micro Edition (Java ME) release includes the following API documentation:
- Java APIs for Bluetooth (JSR 82)
- MIDP 2.1 (JSR 118)
- Mobile Media API (MMAPI) 1.2 (JSR 135)
- J2ME XML Parser Package and J2ME RPC Package (JSR 172)
- Security and Trust Services API for J2ME (JSR 177)
- Content Handler API (JSR 211)
- Java Bindings for OpenGL® ES (JSR 239)
The following additional API documentation is available online:
- PDA Optional Packages for the J2ME Platform (JSR 75)
- Location API for J2ME (JSR 179)
- SIP API for J2ME (JSR 180)
- Mobile 3D Graphics API for J2ME (JSR 184)
- Wireless Messaging API 2.0 (JSR 205)
- Scalable 2D Vector Graphics API for J2ME (JSR 226)
- Payment API (JSR 229)
- Advanced Multimedia Supplements (JSR 234)
- Mobile Internationalization API (JSR 238)
- Mobile Service Architecture (JSR 248)
Version 2.5.2_01 for CLDC (Dec 4, 2008 3:22 PM)
Java vendor: Oracle Corporation
Java version: 1.8.0_66
Operating system: Windows 8.1
Operating system version: 6.3
Architecture: x86
Language: en
Installation directory: C:\WTK2.5.2_01\
https://help.eclipse.org/mars/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2Freference%2Fbreakpoints%2Fref-uncaught_option.htm
Terminated exit value -...
cmd /c emulator.exe -Xdebug -Xrunjdwp:transport=dt_socket,suspend=y,server=y,address=46417 -classpath C:\Users\Admin\AppData\Local\Temp\_eclipseme.tmpAdmin\ArchAngel8265968564617921586.launch\ArchAngel.jar -Xdevice:DefaultColorPhone -Xdescriptor:C:\Users\Admin\AppData\Local\Temp\_eclipseme.tmpAdmin\ArchAngel8265968564617921586.launch\ArchAngel.jad ArchAngel
Enter %temp% to clean temp data. Restart Eclipse to avoid terminated Emulator.
Or use Java Control Pannel
http://www.adam-bien.com/roller/abien/entry/what_are_the_options_of
https://stackoverflow.com/questions/30736498/why-eclipse-debugger-does-not-stop-on-scoped-exception-breakpoint-how-to-stop-o
https://en.wikipedia.org/wiki/MIDlet
Install JavaMe for Eclipse
http://eclipseme.org/docs/installEclipseME.html
https://www.rose-hulman.edu/class/csse/resources/csmobilegames/softwareInstallation/Eclipse/eclipse-j2me-configuration.html
https://docs.oracle.com/javame/config/cldc/rel/3.3/win/gs/html/getstart_win32/setup_eclipseenv.htm
Be careful with Eclipse debug break points.
It seem that when set too many break point could break Eclipse and it refuse to stop / break on line as expected.
Case study 4 class b AA d e with about 30 or more break point.
After remove all break point then re add them then it work again.
J2ME has some override functions like run() paint() keyPressed(). These functions are longest (often) and most important and loop used most.
We can separate to many other funtions and then call it from paint(), run() ... But the base and skeleton / Thread / Main loop of App is based on these function.
So we should follow these function flow to debug App. Just like when we debug thread, flow of application in LibGDX or other thread.
The boredom of infinite boring loop hole vs always exceptions fire.
After a countless of exception metal rain firing, I encounter other loop hole boredom, now I wish I have an exception in the past :)
Deobfuscator
https://stackoverflow.com/questions/40442942/java-deobfuscator-supporting-variable-renaming
Eclipse disable Validation and Error Annotation
https://stackoverflow.com/questions/17037403/make-eclipse-ignore-all-errors-in-current-project
Sometime JAVA code that extracted/decompiled from JAR, .class file is obfuscated and very hard to read and re-compile. There are many optimized code for example variable declare reduce, operator nested precedence ...
So there is somehow a way that original developer compile these optimized program. Can we recompile these program without error ? By configure compiler and / or IDE to match some point ?
After try config Eclipse to ignore error notice, Validation ... It seem that I can not re-compile obfuscated one.
So I have to back to previous solution is that make some change (to pass Eclipse/JAVA validation) before re-compile it.
This is a tedious task because of so many work have to do to make sure modified program is same as obfuscated. Many mathematical precedence order, variable declare, error index OutOfBound or NullPointer ... appear.
http://www.eclipse.org/community/eclipse_newsletter/2013/october/article2.php
Debugging highly complex applications.
Step-Into-Selection
One of the pain points when debugging non-trivial applications is the difficulty of stepping into a method (or function) when multiple methods are on the same line. Imagine that the execution of the program is currently interrupted at the following line:
result = subtract( multiply( add( a, b ), 3 ), 5 ); // line 20
C:\WTK2.5.2_01\lib
All J2ME class lib place here. We can use jar viewer liek jd-gui to view source code. These standard lib is well developed, It may be useful not only core lib but also the convention, business logic and how to build a java lib.
J2ME 3.0 Can old java game run on this new SDK ? as previous 2.5.x SDK.
http://www.oracle.com/technetwork/java/embedded/javame/javame-sdk/downloads/java-me-sdk-3-0-1849684.html
Working with obfuscated code something like hacking other than programming ?
https://github.com/dsasmblr/game-hacking
https://resources.infosecinstitute.com/encrypted-code-reverse-engineering-bypassing-obfuscation/#gref
https://arxiv.org/pdf/1704.02774.pdf
http://findbugs.sourceforge.net/manual/eclipse.html
https://blog.codecentric.de/en/2013/04/again-10-tips-on-java-debugging-with-eclipse/
Compare with app behavior in K-Emulator for inspect missing item like button, text... Sometime button not show but can be clicked:
Then it turn to new case that I expected.
>>>>> run exception <<<<<
java.lang.ArrayIndexOutOfBoundsException
at f.a(+83)
at f.c(+27)
at f.a(+12)
at f.a(+62)
at f.g(+38)
at f.a(+23)
at b.j(+1226)
at b.paint(+281)
at javax.microedition.lcdui.Canvas.callPaint(+85)
at javax.microedition.lcdui.Display.repaint(+82)
at javax.microedition.lcdui.Display$DisplayAccessor.repaint(+14)
at javax.microedition.lcdui.Display$DisplayManagerImpl.repaint(+16)
at com.sun.midp.lcdui.DefaultEventHandler.repaintScreenEvent(+24)
at com.sun.midp.lcdui.DefaultEventHandler$QueuedEventHandler.run(+519)
>>>>> run exception <<<<<
Shift byte operatior
https://stackoverflow.com/questions/10910913/how-do-shift-operators-work-in-java
>>>>> run exception <<<<<
java.lang.ArrayIndexOutOfBoundsException
at f.a(+162)
at f.b(+24)
at f.a(+5)
at f.a(+62)
at f.g(+38)
at f.a(+23)
at b.j(+1226)
at b.paint(+281)
The line number of error log is not correct. We only judge it by compare the relative value. For example the f.a() has many value +12 +23 +62 and +162 ... So we can use these value to judge the position of Exception, function() that error occur. From 62 to 162 is a huge change, (100 value) so this a(+162) may be in far bottom of f.java (ab 1700 LOC).
In reality f.a(+162) seem to be at ab line 702.
I think this incorrect line number is not a bug, if it is then not a high priority since it seem quite difficult to get exact location of Exception. There are many thing affected this, compiler is a very complex system software. System software example is OS (gigantic), drivers, compiler etc.
Refactoring tool, learn on the go.
As Refactor book by Martin Fowler, I see some refactor tool in Eclipse IDE and try to understand, using it.
It is important to have some source code that write in J2ME for reference. It very useful in some case that we want to refactor function, variable name etc. These source can be found on internet. I will update some more sample link. One is here:
J2ME API document: https://docs.oracle.com/javame/config/cldc/ref-impl/midp2.0/jsr118/javax/microedition/lcdui/package-summary.html
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