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Commit fe3b96a

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cirosantillicirosantilli
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‎Main.java‎

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+430-94Lines changed: 430 additions & 94 deletions
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‎Makefile‎

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+10-8Lines changed: 10 additions & 8 deletions
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OUT_DIR ?= ./target/
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ARGS ?=
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OUT_DIR ?= .
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OUT_EXT ?= .class
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RUN ?= Main
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.PHONY: all clean mkdir run
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-include Makefile_params
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all: mkdir $(OUTS)
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.PHONY: all clean mkdir run
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# TODO add: -source 1.7.
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# Problem: gives warning on Java 8.
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all:
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# TODO add: -source 1.7 -bootclasspath /usr/lib/jvm/java-7-oracle/jre/lib/rt.jar
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# Without `bootclasspath`, gives warning on Java 8.
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all: mkdir
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javac -d '$(OUT_DIR)' *.java
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clean:
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rm -rf $(OUT_DIR)
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if [ '$(OUT_DIR)' = '.' ]; then rm -f *$(OUT_EXT); else rm -rf $(OUT_DIR); fi
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mkdir:
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mkdir -p $(OUT_DIR)
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run: all
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cd $(OUT_DIR) && java -ea -D'custom.property=value' $(RUN) arg0 arg1
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cd $(OUT_DIR) && java -ea -D'custom.property=value' $(RUN) $(ARGS)
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‎Makefile_params‎

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ARGS := arg0 arg1
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OUT_DIR := ./target/
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‎README.md‎

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+23-34Lines changed: 23 additions & 34 deletions
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@@ -10,22 +10,25 @@ Java information and cheatsheets.
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- [Maven](maven/)
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- [java utility](java-utility.md)
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- [JVM](jvm.md)
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- [Bytecode](bytecode/)
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- [Javadoc](javadoc/)
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- [update-java-alternatives](update-java-alternatives.md)
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- [JAR](jar.md)
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- [javac](javac/)
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- [Tomcat](tomcat.md)
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- [JNI](jni/)
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WIP:
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- [Bytecode](bytecode.md)
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- [Spring](spring/)
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- [JDB](jdb.md)
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- [Jasmin](jasmin/)
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- [javap](javap.md)
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- [JDB](jdb.md)
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- [Mockito](mockito/)
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- [Java 8](java8/)
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- [Spring](spring/)
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- [Mockito](jasmin/)
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- [WatchService](watch-service/)
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- [Ant](ant.md)
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- [JMX](jmx.md)
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Requirements for most directories:
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Java comes with several CLI utilities.
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### update-java-alternatives
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If you are maintaining two Java version on a single Linux machine, you can run `update-alternatives` for executables in one go.
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List available alternatives:
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update-java-alternatives -l
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Sample output:
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java-7-oracle 1 /usr/lib/jvm/java-7-oracle
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java-8-oracle 2 /usr/lib/jvm/java-8-oracle
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Choose one of the alternatives:
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sudo update-java-alternatives -s java-7-oracle
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### java_vm
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TODO
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## JAVA_HOME
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TODO what is it? Is it necessary even if the Java executable is already selected? <http://stackoverflow.com/questions/5102022/what-does-the-java-home-environment-variable-do>
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If:
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readlink -f `which java`
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says:
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/usr/lib/jvm/java-7-oracle/jre/bin/java
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then you could set:
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export JAVA_HOME='/usr/lib/jvm/java-7-oracle'
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TODO what is it? <http://stackoverflow.com/questions/5102022/what-does-the-java-home-environment-variable-do> Setting it does not change whih `java` utility is found, that depends only on the `PATH`.
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## Classpath
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- <https://google-styleguide.googlecode.com/svn/trunk/javaguide.html>
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### Lint tools
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<http://stackoverflow.com/questions/14691926/is-there-a-simple-cli-java-linter>
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- FindBugs
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### Formal verification
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JML is the most popular verification input format as part of comments.
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Tools that verify it include:
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- some JML project tools: <http://www.eecs.ucf.edu/~leavens/JML/download.shtml>
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- <http://www.key-project.org/>
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## Sources
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- <http://tutorials.jenkov.com/>. Every tutorial is to the point, and filled with examples. My type of tutorial.
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‎bytecode.md‎

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‎bytecode/LocalsOverflow.j‎

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; What happens when we use more locals than we declare:
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;
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; Illigal local variable number
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.class public LocalsOverflow
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.super java/lang/Object
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.method public static main([Ljava/lang/String;)V
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.limit locals 1
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aload_1
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return
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.end method
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‎bytecode/Main.j‎

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; Main Java bytecode cheatsheet in Jasmin.
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;
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; We will use other tools for stuff that Jasmin cannot do.
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;
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; This will not discuss the Jasmin syntax itself.
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.class public Main
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.super java/lang/Object
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.method public <init>()V
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aload_0
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invokenonvirtual java/lang/Object/<init>()V
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return
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.end method
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.method public static main([Ljava/lang/String;)V
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.limit stack 1024
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; # new
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; # invokespecial
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; Must initialize before usage, or `VerifyError`:
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; https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.10.2.4
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getstatic java/lang/System/out Ljava/io/PrintStream;
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new java/lang/Integer
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dup
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iconst_1
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invokespecial java/lang/Integer/<init>(I)V
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invokevirtual java/io/PrintStream/println(Ljava/lang/Object;)V
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getstatic java/lang/System/out Ljava/io/PrintStream;
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ldc "ALL ASSERTS PASSED"
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invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V
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return
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.end method
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‎bytecode/Makefile‎

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../jasmin.makefile
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‎bytecode/NewInvokespecialTwice.j‎

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; VerifyError Expecting to find unitialized object on stack
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; https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.10.2.4
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.class public NewInvokespecialTwice
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.super java/lang/Object
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.method public static main([Ljava/lang/String;)V
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.limit stack 5
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getstatic java/lang/System/out Ljava/io/PrintStream;
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new java/lang/Integer
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dup
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dup
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iconst_1
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invokespecial java/lang/Integer/<init>(I)V
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iconst_1
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invokespecial java/lang/Integer/<init>(I)V
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return
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.end method
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‎bytecode/NewWithoutInvokespecial.j‎

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; VerifyError Expecting to find object/array on stack
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; https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.10.2.4
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.class public NewWithoutInvokespecial
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.super java/lang/Object
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.method public static main([Ljava/lang/String;)V
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.limit stack 4
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getstatic java/lang/System/out Ljava/io/PrintStream;
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new java/lang/Integer
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; dup
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; iconst_1
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; invokespecial java/lang/Integer/<init>(I)V
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invokevirtual java/io/PrintStream/println(Ljava/lang/Object;)V
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return
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.end method

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