3 tool matters
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The document summarizes Java development tools including: - Compilation tools like javac and jar for compiling and packaging Java code - Execution tools like java for running compiled code with options like -classpath and -jar - JVM monitoring and troubleshooting tools like jps, jstack, jstat, jmap, jhat and jvisualvm - Eclipse is mentioned as the official Java IDE but other options like IntelliJ and NetBeans are also good choices - Exercises are provided to use the tools on sample code projects and debugging code
3 tool matters
- 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-鍖le
- 4. Manifest-鍖le 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 鍖les and output to classes directory Create jar 鍖le Write main class, manifest-鍖le Create jar 鍖le Create another two jar 鍖les, 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>
- 14. Exercises Run compiled class Run packed jar 鍖le by specifying classpath Run packed jar 鍖le using -jar Try different -XX options
- 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,鍖le=<鍖lename> jhat Analyze dump 鍖le generated by jmap Start an http server where to connect to show analysis result mat Memory Analyzer Dump 鍖le analysis tool based on Eclipse More ef鍖cient and be able to analyze really large dump 鍖le 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. Of鍖cial One - Eclipse Workspace Template Editor Working set Keymap Debug Formatter
- 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