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I understand that Eclipse uses it's own compiler for Java (ECJ) which has the ability to perform incremental compilation. From most of the readings I have found, this compilation is generally triggered by a save action, but that doesn't seem to match up with the fact that you get error feedback on compilation errors almost immediately after typing a single unit/word of code. I haven't found any documentation or literature that states at what granularity this is triggered (i.e every word, letter, line)? Is there additional background code analysis of some sort going on? Although aside from error detection in syntax , I don't see how this would be able to detect semantic errors that can only be revealed through a compilation process.
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The Incremental Compiler is such a compilation scheme in which only modified source text gets recompiled and merged with previously compiled code to form a new target code. Thus incremental compiler avoid recompilation of the whole source code on some modification.
That is the reason Projects usually open much faster in Eclipse, whereas in the case of IntelliJ, it indexes the entire project while importing and starting the project in IDE that is why it comparatively consumes much time for starting the project.
Press Ctrl+Alt+S to open the IDE settings and select Build, Execution, Deployment | Compiler. On the Compiler page, select Build project automatically. Now when you make changes in the class files, IntelliJ IDEA automatically performs the incremental build of the project.
The user may need to navigate through all the module that contains various web service; at the time of project development. Then programmers use eclipse for maintaining such kind of scenarios. Using IntelliJ, development becomes easier, and it also provides features like. Dropdowns, code completion, quick view, project wizards, etc.
The tight integration of the compiler allows Eclipse to invoke the compiler in all kinds of situations, two of which are relevant for this question:
The term "incremental compilation" typically refers to compilation on save, which may then trigger compiling more files that depend on a changed file. In technical jargon, this is called "building" which reads .java files and produces .class files.
Even more immediate feedback is given by compilation-as-you-type. Such compilation is based on in-memory working copies rather than files. You may even edit several dependent files without saving, and compilation can already see the changes that have been made on other working copies. In technical jargon this is called "reconciling". Although this feature is implemented by an invocation of the full compiler, reconciling does not produce any class files.
As for the original question of trigger granularity: Reconciling works on a per-editor queue of dirty regions. Recording dirty regions is triggered by keystrokes in the editor. The queue is then polled with a default delay of 500 ms.
In addition to the more immediate feedback, users will experience that reconciling creates error markers only in the editor, while building additionally makes those markers visible in the Problems or Markers views.
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