Fix java doc

docs/layers/lang/java.md

@@ -1,6 +1,6 @@
 ---
 title: "SpaceVim lang#java layer"
-description: "This layer is for Java development"
+description: "This layer is for Java development. All the features such as code completion, formatting, syntax checking, REPL and debug have be done in this layer."
 ---
 
 # [SpaceVim Layers:](https://spacevim.org/layers) lang#java
@@ -8,13 +8,15 @@ description: "This layer is for Java development"
 <!-- vim-markdown-toc GFM -->
 
 - [Description](#description)
-- [Layer Installation](#layer-installation)
+- [Feature](#feature)
+- [Install](#install)
 - [Key bindings](#key-bindings)
-  - [Java language specified key bindings](#java-language-specified-key-bindings)
-    - [Maven](#maven)
-    - [Jump](#jump)
-  - [Problems buffer](#problems-buffer)
-  - [Project buffer](#project-buffer)
+  - [Import key bindings](#import-key-bindings)
+  - [Generate key bindings](#generate-key-bindings)
+  - [Code formatting](#code-formatting)
+  - [Maven](#maven)
+  - [Jump](#jump)
+  - [Inferior REPL process](#inferior-repl-process)
 
 <!-- vim-markdown-toc -->
 
@@ -22,15 +24,22 @@ description: "This layer is for Java development"
 
 This layer is for Java development.
 
-## Layer Installation
+## Feature
+
+- code completion: `autocomplete` layer
+- code formatting
+- refactoring
+- syntax checking: `checkers` layer
+- REPL(need java8's jshell)
+- debug: check out the `debug` layer
+
+## Install
 
 To use this configuration layer, add `SPLayer 'lang#java'` to your custom configuration file.
 
 ## Key bindings
 
-### Java language specified key bindings
-
-**Import key bindings:**
+### Import key bindings
 
 | Key Binding          | Description                     |
 | -------------------- | ------------------------------- |
@@ -42,24 +51,24 @@ To use this configuration layer, add `SPLayer 'lang#java'` to your custom config
 | `<C-j>R` (Insert)    | Remove unused classes           |
 | `<C-j>i` (Insert)    | smart import class under cursor |
 
-**Generate key bindings:**
+### Generate key bindings
 
 | 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   |
-| normal        | `SPC l M`   | generate abstract methods             |
+| normal        | `SPC l g A`   | generate accessors                    |
+| normal/visual | `SPC l g s`   | generate setter accessor              |
+| normal/visual | `SPC l g g`   | generate getter accessor              |
+| normal/visual | `SPC l g a`   | generate setter and getter accessor   |
+| normal        | `SPC l g M`   | generate abstract methods             |
 | 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 ts`  | generate toString function            |
-| normal        | `SPC l eq`  | generate equals and hashcode function |
-| normal        | `SPC l c`   | generate constructor                  |
-| normal        | `SPC l C`   | generate default constructor          |
+| normal        | `SPC l g t`  | generate toString function            |
+| normal        | `SPC l g e`  | generate equals and hashcode function |
+| normal        | `SPC l g c`   | generate constructor                  |
+| normal        | `SPC l g C`   | generate default constructor          |
 
-**Code formatting:**
+### Code formatting
 
 the default key bindings for format current buffer is `SPC b f`. and this key bindings is defined in [format layer](<>). you can also use `g=` to indent current buffer.
 
@@ -68,7 +77,7 @@ 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.
 
-#### Maven
+### Maven
 
 | Key Binding | Description                    |
 | ----------- | ------------------------------ |
@@ -79,12 +88,20 @@ to SpaceVim custom configuration file.
 | `SPC l m R` | Run one maven goal             |
 | `SPC l m t` | Run maven test                 |
 
-#### Jump
+### Jump
 
 | Key Binding | Description            |
 | ----------- | ---------------------- |
 | `SPC l j a` | jump to alternate file |
 
-### Problems buffer
+### Inferior REPL process
 
-### Project buffer
+Start a `jshell` inferior REPL process with `SPC l s i`. 
+
+Send code to inferior process commands:
+
+| Key Binding | Description                                      |
+| ----------- | ------------------------------------------------ |
+| `SPC l s b` | send buffer and keep code buffer focused         |
+| `SPC l s l` | send line and keep code buffer focused           |
+| `SPC l s s` | send selection text and keep code buffer focused |