a series of basic java training courses, this is the third one

1. Java Basic Training
III. Tool Matters

2. Compilation and
Packaging

3. javac
-classpath/-cp
-d
-source/-target
-encoding
jar
Behaves similar as “tar”
-m manifest-file

4. Manifest-file
META-INF/MANIFEST.MF
Manifest-Version: 1.0
Created-By: 1.6.0 (Sun Microsystems Inc.)
Main-Class: c.e.m.j.Main
Class-Path: lib/a.jar lib/b.jar

5. Exercises
Compile a bunch of .java files and output to
“classes” directory
Create jar file
Write “main” class, manifest-file
Create jar file
Create another two jar files, and try “Class-
Path”

6. Execution

7. java
-classpath/-cp
-jar
-client/-server
-d32/-d64
-D<name>=<value>
-X
-Xms<size>
-Xmx<size>
-Xss<size>
-XX

8. JVM Heap
Young Generation Eden Space C
A
B
from to
Old Generation Tenured Space
Permanent
Generation
class
A
class
B
class
C Permanent Space class
D
class
E
class
F

9. JVM Heap
GC1
B
Young Generation Eden Space C
to from
Old Generation Tenured Space
Permanent
Generation
class
A
class
B
class
C Permanent Space class
D
class
E
class
F

10. JVM Heap
GC1 GC2
Young Generation Eden Space
from to
Old Generation Tenured Space B
Permanent
Generation
class
A
class
B
class
C Permanent Space class
D
class
E
class
F

11. JVM Total Memory
JVM heap
Thread execution stack
JVM itself

12. JVM Total Memory
JVM heap
Thread execution stack
JVM itself
think about -Xmx<size>

13. -XX
-XX:DisableExplicitGC
-XX:UseParallelGC
-XX:UseParallelOldGC
-XX:MaxPermSize=<size>
http://www.oracle.com/technetwork/java/
javase/tech/vmoptions-jsp-140102.html

14. Exercises
Run compiled class
Run packed jar file by specifying classpath
Run packed jar file using “-jar”
Try different -XX options

15. Tuning & Troubleshooting

16. jps
List all JVM instances
Compared with “ps -elf | grep java”
jstack
Print thread stack dump of a JVM instance
Similar as “pstack” and “gstack”
jstat
JVM statistics monitoring
http://docs.oracle.com/javase/1.5.0/docs/
tooldocs/share/jstat.html

17. jmap
Dump all JVM objects
jmap -dump:live,format=b,file=<filename>
jhat
Analyze dump file generated by “jmap”
Start an http server where to connect to show analysis result
mat
Memory Analyzer
Dump file analysis tool based on Eclipse
More efficient and be able to analyze really large dump file
jvisualvm
Originated in NetBeans
All-in-one tuning and troubleshooting tool

18. Exercises
Try all the tools mentioned one by one

19. The IDE

20. What Makes a Language
Widely Accepted
Simple & Stupid
Off-the-shelf libraries
Powerful IDE

21. Official One - Eclipse
Workspace Template
Editor Working set
Keymap Debug
Formatter

22. Other Good Choices
IDEA
NetBeans
Anymore?

23. Exercises
Rewrite Workable, Resource, Designer, Tester
Try to set up working set
Set a breakpoint, and debug

24. Homework
Apply all the tools to AddressBook project
You may skip compilation and packaging
tools
You must execute your compiled binary
from CLI using “java”
Tuning and troubleshooting tools are
mandatory