Update doc for java layer

docs/layers/lang/java.md

@@ -1,53 +1,83 @@
-# [Layers](https://spacevim.org/layers) > lang#java
+---
+title: "SpaceVim lang#java layer"
+---
+
+# [SpaceVim Layers:](https://spacevim.org/layers) lang#java
+
+
+<!-- vim-markdown-toc GFM -->
+* [Description](#description)
+* [Layer Installation](#layer-installation)
+* [Key bindings](#key-bindings)
+    * [Java language specified key bindings](#java-language-specified-key-bindings)
+        * [Maven](#maven)
+    * [Problems buffer](#problems-buffer)
+    * [Project buffer](#project-buffer)
+
+<!-- vim-markdown-toc -->
+
+## Description
 
 This layer is for Java development.
 
-## Install
+## Layer Installation
 
 To use this configuration layer, add `SPLayer 'lang#java'` to your custom configuration file.
 
+## Key bindings
 
-## Mappings
+### Java language specified key bindings
 
-  Import mappings:
+**Import key bindings:**
 
-  Mode      Key           Function
-  -------------------------------------------------------------
-  normal    <F4>          import class under cursor
-  insert    <F4>          import class under cursor
-  normal    <leader>jI    import missing classes
-  normal    <leader>jR    remove unused imports
-  normal    <leader>ji    smart import class under cursor
-  normal    <leader>jii   same as <F4>
-  insert    <c-j>I        import missing imports
-  insert    <c-j>R        remove unused imports
-  insert    <c-j>i        smart import class under cursor
-  insert    <c-j>ii       add import for class under cursor
+Key Binding | Description
+-----------| -----------
+`F4` (Insert/Normal) | Import class under cursor
+`SPC l I` | Import missing classes
+`SPC l R` | Remove unused classes
+`SPC l i` | smart import class under cursor
+`<C-j>I` (Insert) | Import missing classes
+`<C-j>R` (Insert) | Remove unused classes
+`<C-j>i` (Insert) | smart import class under cursor
 
-  Generate mappings:
 
-  Mode      Key           Function
-  -------------------------------------------------------------
-  normal    <leader>jA    generate accessors
-  normal    <leader>js    generate setter accessor
-  normal    <leader>jg    generate getter accessor
-  normal    <leader>ja    generate setter and getter accessor
-  normal    <leader>jts   generate toString function
-  normal    <leader>jeq   generate equals and hashcode function
-  normal    <leader>jc    generate constructor
-  normal    <leader>jcc   generate default constructor
-  insert    <c-j>s        generate setter accessor
-  insert    <c-j>g        generate getter accessor
-  insert    <c-j>a        generate getter and setter accessor
-  visual    <leader>js    generate setter accessor
-  visual    <leader>jg    generate getter accessor
-  visual    <leader>ja    generate setter and getter accessor
+**Generate key bindings:**
 
-## Code formatting
+Mode | Key Binding | Description
+----- | ------| -----------
+normal | `SPC l A` | generate accessors
+normal/visual | `SPC l s` | generate setter accessor
+normal/visual | `SPC l g` | generate getter accessor
+normal/visual | `SPC l a` | generate setter and getter accessor
+insert | `<c-j>s` | generate setter accessor
+insert | `<c-j>g` | generate getter accessor
+insert | `<c-j>a` | generate getter and setter accessor
+normal | `SPC l t s` | generate toString function
+normal | `SPC l e q` | generate equals and hashcode function
+normal | `SPC l c` | generate constructor
+normal | `SPC l C` | generate default constructor
+
+**Code formatting:**
+
+the default key bindings for format current buffer is `g=`.
 
 To make neoformat support java file, you should install uncrustify. or
-download google's formater jar from:
+download [google's formater jar](https://github.com/google/google-java-format)
+and add `let g:spacevim_layer_lang_java_formatter = 'path/to/google-java-format.jar'`
+to SpaceVim custom configuration file.
 
-https://github.com/google/google-java-format
+#### Maven
+
+Key Binding | Description
+-----------| -----------
+`SPC l m i` | Run maven clean install
+`SPC l m I` | Run maven install
+`SPC l m p` | Run one already goal from list
+`SPC l m r` | Run maven goals
+`SPC l m R` | Run one maven goal
+`SPC l m t` | Run maven test
+
+### Problems buffer
+
+### Project buffer
 
-and set 'g:spacevim_layer_lang_java_formatter' to the path of the jar.