javac

I receive the following warning: [javac] build.xml:9: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds What does this mean? Ant Runtime Simply set includeantruntime="false" : <javac includeantruntime="false" ...>...</javac> If you have to use the javac -task multiple times you might want to consider using PreSetDef to define your own javac -task that always sets includeantruntime="false" . Additional Details From http://www.coderanch.com/t/503097/tools/warning-includeantruntime-was-not-set : That's caused by a misfeature

I've the root directory like this : ├── classes └── src └── vehicles ├── Bicycle.java └── BicycleMain.java Bicycle.java package vehicles; public class Bicycle { public int cadence; public int gear; public int speed; public Bicycle(int startCadence, int startSpeed, int startGear) { gear = startGear; cadence = startCadence; speed = startSpeed; } public void setCadence(int newValue) { cadence = newValue; } public void setGear(int newValue) { gear = newValue; } public void setSpeed(int newValue) { speed = newValue; } public int getGear() { return gear; } public int getCadence() { return cadence; }

Here's a simple class that demonstrates the issue: package com.mimvista.debug; public class DefaultCollisionTest { public static interface Interface1 { public String getName(); } public static interface Interface2 { public default String getName() { return "Mr. 2"; }; } public static <X extends Interface1&Interface2> String extractName(X target) { return target.getName(); } } Eclipse (Neon 2) happily compiles this class while javac (JDK 1.8.0_121) spits out the following compile error: $ javac src/com/mimvista/debug/DefaultCollisionTest.java src\com\mimvista\debug\DefaultCollisionTest.java:13:

Ex. javac -g ButtMonkey.java Where do you configure the -g flag when Eclipse compiles Java source? (Using Ganymede but I doubt that has changed in later versions so any answer probably helps.) What I need is: -g Generate all debugging information, including local variables. By default, only line number and source file information is generated. Select the menu: Window > Preferences > Java > Compiler There you will find several check boxes under the heading "Classfile Generation". 来源： https://stackoverflow.com/questions/9483315/where-do-you-configure-eclipse-java-compiler-javac-flags

Recently I encountered a file character encoding issue that I cannot remember ever having faced. It's quite common to have to be aware of character encoding of text files and write code that handles encoding correctly when run on different platforms. But the problem I found was caused by compilation on a different platform from the execution platform. That was entirely unexpected, because in my experience when javac creates a class file, the important parameters are the java source and target params, and the version of the JDK doing the compile. I my case, classes compiled with JDK 1.6.0_22 on

I have a program that allows a user to type java code into a rich text box and then compile it using the java compiler. Whenever I try to compile the code that I have written I get an error that says that I have an illegal character at the beginning of my code that is not there. This is the error the compiler is giving me: C:\Users\Travis Michael>"\Program Files\Java\jdk1.6.0_17\bin\javac" Test.java Test.java:1: illegal character: \187 public class Test ^ Test.java:1: illegal character: \191 public class Test ^ 2 errors The BOM is generated by, say, File.WriteAllText() or StreamWriter

To tell the truth, I am quite confused on all these terms (JDK/JRE/Java SDK). I am not sure what each one does. When I first started doing simple java examples in eclipse, I am pretty sure I only had the JRE, which I believed was the default java installer regular users use to be able to run java programs/applets on their system. However, now in class we are using Google Appengine, and this requires the JDK which I am guessing is the same as Java SDK. After wasting some time finding out that installing the JDK meant I also had to add java/bin to the environment variables to get javac -version