Generating the compile classpath is going to be a real pain to do manually. javac -cp lib1.jar lib2.jar lib3.jar MyProgram.java You need to add to it all the jar files referenced by code in your application in order for compilation to work. That’s where the compile classpath comes in. For example, Spring Boot, Apache Commons Lang 3, or Guava. It’s also very likely that once you get beyond Hello World applications you’ll need to use functionality provided by 3rd party libraries, or more specifically jar files. That’s not going to be much fun to do by hand! □ javac Program1.java Program2.java Program3.java The Java Development Kit (JDK) comes with the Java compiler command javac. Or at least print out Hello World!! Compiling without a build toolĬompiling Java code is actually something you can do without a build tool. Bytecode can be run on the Java Virtual Machine, the JVM, which is where applications can work their magic and fulfil business requirements. This process of generating the bytecode is called compilation. Or in other words, transform your application from human readable code to machine readable code, or in technical lingo bytecode. Well, you’re going to have to compile it first. Whether you have a tiny application like this, or a huge application, it’s still just source files in a directory structure. It’s the code that we as developers write, and in theory can read and understand too! java extension, also known as a source file. It’s just a single Java class within a directory structure. Yes, it may well be the same as the first Java application you ever wrote, listed on a thousand tutorial websites. Let’s consider a simple Java application and what needs to be done to transform it from just being some source code in a repository, to being an application ready to be executed. Why do we need build tools?įirst up, lets get right back to basics to understand why we need build tools, also known as build automation tools, anyway. Ideally, you should have some Java knowledge as this tutorial is focussed on building Java applications. If you have used Gradle, but are feeling confused and want to understand the basics, this is for you too. This is a tutorial for complete beginners after all. If you’ve never used Gradle before you’re in the right place.
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