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Eclipse Error

ERROR: JDWP Unable to get JNI 1.2 environment, jvm->GetEnv() return code = -2JDWP exit error AGENT_ERROR_NO_JNI_ENV(183): [../../../src/share/back/util.c:820]

http://www.fantasypublishings.com/morePhpHelp/java__ERROR_JDWP_Unable_to_get_JNI_12_environment__Stack_Overflow_page86817.php


Check eclipse 32 bit or 64 bit
http://stackoverflow.com/questions/5103366/how-to-find-out-if-an-installed-eclipse-is-32-or-64-bit-version

java logger

http://www.vogella.com/tutorials/Logging/article.html


  Regarding hierarchical of class: When a logger decides to produce a LogRecord, the logger not only passes the LogRecord to all its attached Handler(s), but it also forwards the LogRecord to its parent logger. The parent logger forwards the LogRecord to all its attached Handler(s) and its parent, without performing level or filter check. Eventually, the LogRecord reaches the root logger. By default, the root logger has a ConsoleHandler (that writes to System.err) with level of INFO.

http://www.ntu.edu.sg/home/ehchua/programming/java/JavaLogging.html

Not printing to output
http://stackoverflow.com/questions/920654/java-logger-only-to-file-no-screen-output

Java to C# converter

C# to Java converter can use CS2J
Command:
CS2jTranslator\bin\cs2j.exe -net-templates-dir=.\NetFramework\ -out-java-dir=..\Code_SPL_java -app-dir=..\Code_SPL -cs-dir=..\Code_SPL

..\Code_SPL is input directory (.net directory)
..\Code_SPL_java is output directory (generated java directory)

Java to C# converter (Microsoft's JLCA)


I have used both tools before, both provide reasonable conversion, but still need to change the code by your own.

JMetals

1. How to change the initialize population (in algorithms)

2. How to encode in int[] (solution type)

3. How to make it evaluate fitness function (in problem, evaluate, set objective value for a solution(gene))

4. What is the use of evaluateConstraints (in problem, evaluate, set #constraintsViolated for a solution(gene))

5. How to sort the population (there is a sort function in algorithm.execute())

6. How to change the evaluation of crossover and mutation (is it working on clone)? (Yes)

7. What I should do about for quality indicator
8. The objective functions in the problem are to be minimized (the smaller the better).

Main(Problem, Algorithm, Operator, parameters)

Problem (the problem to be solve, #obj,#constraint,#var) ->SolutionType(Types that is used by the genes) -> CreateVariables(Create contents in the genes for initial population)

Algorithm (e.g., GA, execute()) -> create initial population (SolutionSet(Population) -> Solution (Gene Instance))


For IBEA
Spread, etc. are just quality indicators that it is used to judged the multiobjective optimization, it is not used in the process. The indicator used in the process is the hypervolume indicator.

Keyboard shortcuts Eclipse

Debug Mode in Eclipse for Source Not Found
"window->Preferences->Java->Debug" and disable the "suspend execution of uncaught exceptions"
http://stackoverflow.com/questions/10121214/has-myeclipse-implicit-breakpoint-in-debugging-mode-in-class-urlclasspath

If I'm reading you right, you want to specify some classes that you 
don't want to step into? I think what you want is...

Window -> Preferences -> Java -> Debug -> Step Filtering
http://www.eclipse.org/forums/index.php/t/101609/

Task Windows (Windows>Show View>Tasks, find Todo in Eclipse)
See the following on how to change configure Task Windows
http://www.mooreds.com/wordpress/archives/446

Add shortcut key to bookmarks
Windows>preference>Key>search for "add bookmark"
set alt+b (in windows)
http://stackoverflow.com/questions/3141493/bookmarks-in-eclipse-set-and-go-using-hotkeys-do-they-exist

Adding bookmark / Open bookmark windows

http://sandarenu.blogspot.sg/2008/02/using-bookmarks-in-eclipse.html

Finding classes/packages (ctrl+shift+h)

http://stackoverflow.com/questions/8944994/how-to-find-package-by-name-in-eclipse

Find usage (ctrl+shift+g)

Find type declaration (ctrl+g)

Eclipse Shortcut (alt+left arrow)

Generate Constructor (Alt+Shift+S, O)
http://www.eclipseonetips.com/2010/03/08/generate-class-constructors-in-eclipse-based-on-fields-or-superclass-constructors/

includes import
ctrl+shift+o

Open file in explorer
http://basti1302.github.io/startexplorer/

Formatting code
ctrl+shift+f

Formatting code upon save
http://www.eclipseonetips.com/2009/12/13/automatically-format-and-cleanup-code-every-time-you-save/

Automatic put semicolon at the end
http://www.eclipseonetips.com/2010/02/22/place-a-semicolon-at-the-end-of-a-java-statement-in-eclipse/

Duplicate Lines

Ctrl-Alt-Down: copies current line or selected lines to below

Ctrl-Alt-Up:: copies current line or selected lines to above

Ctrl-Shift-L: brings up a List of shortcut keys

Rename variable
ALT+SHIFT+R 


Time different

long beginTime = System.currentTimeMillis();

//Some operations. Let us asssume some database operations etc. which are time consuming.

//

long endTime = System.currentTimeMillis();

long difference = endTime - beginTime;

I prefer visual presentation:

╔══════════════╦═════════════════════╦═══════════════════╦══════════════════════╗
║   Property   ║       HashMap       ║      TreeMap      ║     LinkedHashMap    ║
╠══════════════╬═════════════════════╬═══════════════════╬══════════════════════╣
║              ║  no guarantee order ║ sorted according  ║                      ║
║   Order      ║ will remain constant║ to the natural    ║    insertion-order   ║
║              ║      over time      ║    ordering       ║                      ║
╠══════════════╬═════════════════════╬═══════════════════╬══════════════════════╣
║  Get/put     ║                     ║                   ║                      ║
║   remove     ║         O(1)        ║      O(log(n))    ║         O(1)         ║
║ containsKey  ║                     ║                   ║                      ║
╠══════════════╬═════════════════════╬═══════════════════╬══════════════════════╣
║              ║                     ║   NavigableMap    ║                      ║
║  Interfaces  ║         Map         ║       Map         ║         Map          ║
║              ║                     ║    SortedMap      ║                      ║
╠══════════════╬═════════════════════╬═══════════════════╬══════════════════════╣
║              ║                     ║                   ║                      ║
║     Null     ║       allowed       ║    only values    ║       allowed        ║
║ values/keys  ║                     ║                   ║                      ║
╠══════════════╬═════════════════════╩═══════════════════╩══════════════════════╣
║              ║   Fail-fast behavior of an iterator cannot be guaranteed       ║
║   Fail-fast  ║ impossible to make any hard guarantees in the presence of      ║
║   behavior   ║           unsynchronized concurrent modification               ║
╠══════════════╬═════════════════════╦═══════════════════╦══════════════════════╣
║              ║                     ║                   ║                      ║
║Implementation║      buckets        ║   Red-Black Tree  ║    double-linked     ║
║              ║                     ║                   ║       buckets        ║
╠══════════════╬═════════════════════╩═══════════════════╩══════════════════════╣
║      Is      ║                                                                ║
║ synchronized ║              implementation is not synchronized                ║
╚══════════════╩════════════════════════════════════════════════════════════════╝

http://eclipse.dzone.com/news/effective-eclipse-shortcut-key