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Refine FAQ (#6512)

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14
docs/en/FAQ/Import-Project-Eclipse-RequireItems-Exception.md
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### Problem
- Import skywalking project to Eclipse,Occur following errors:
- When importing the SkyWalking project to Eclipse, the following errors may occur:
> Software being installed: Checkstyle configuration plugin for
> M2Eclipse 1.0.0.201705301746
> (com.basistech.m2e.code.quality.checkstyle.feature.feature.group
@ -8,10 +8,10 @@
> 1.0.0.201705301746) requires 'net.sf.eclipsecs.core 5.2.0' but it could not be found
### Reason
Haven't installed Eclipse Checkstyle Plug-in
The Eclipse Checkstyle Plug-in has not been installed.
### Resolve
Download the plugin through the link:https://sourceforge.net/projects/eclipse-cs/?source=typ_redirect，Eclipse Checkstyle Plug-in version:8.7.0.201801131309 plugin required.
plugin notification:
The Eclipse Checkstyle plug-in integrates the Checkstyle Java code auditor into the Eclipse IDE. The plug-in provides real-time feedback to the user about
violations of rules that check for coding style and possible error prone code constructs.
### Resolution
Download the plug-in at the link here: https://sourceforge.net/projects/eclipse-cs/?source=typ_redirect
Eclipse Checkstyle Plug-in version 8.7.0.201801131309 is required.
Plug-in notification:
The Eclipse Checkstyle plug-in integrates the Checkstyle Java code auditor into the Eclipse IDE. The plug-in provides real-time feedback to the user on rule violations, including checking against coding style and error-prone code constructs.

14
docs/en/FAQ/Memory-leak-enhance-Worker-thread.md
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### Problem
When using a thread pool, `TraceSegment` data in a thread cannot be reported and there are memory data that cannot be recycled (memory leaks)
When using a thread pool, `TraceSegment` data in a thread cannot be reported and there are memory data that cannot be recycled (memory leaks).
### Example
``` java
@ -9,16 +9,16 @@ When using a thread pool, `TraceSegment` data in a thread cannot be reported and
### Reason
* Worker threads are enhanced, when using thread pool.
* According to the SkyWalking Java Agent design, when you want to trace cross thread, you need to enhance the task thread.
* Worker threads are enhanced when using the thread pool.
* Based on the design of the SkyWalking Java Agent, when tracing a cross thread, you must enhance the task thread.
### Resolve
### Resolution
* When using `Thread Schedule Framework`
Checked SkyWalking Thread Schedule Framework at [SkyWalking Java agent supported list](../setup/service-agent/java-agent/Supported-list.md), such as Spring FrameWork @Async, which can implement tracing without any modification.
See SkyWalking Thread Schedule Framework at [SkyWalking Java agent supported list](../setup/service-agent/java-agent/Supported-list.md), such as Spring FrameWork @Async, which can implement tracing without any modification.
* When using `Custom Thread Pool`
Enhance the task thread with the following usage.
Enhance the task thread with the following code.
```java
ExecutorService executorService = Executors.newFixedThreadPool(1);
@ -28,5 +28,5 @@ Enhance the task thread with the following usage.
}
}));
```
See [across thread solution APIs](../setup/service-agent/java-agent/Application-toolkit-trace-cross-thread.md) for more usage
See [across thread solution APIs](../setup/service-agent/java-agent/Application-toolkit-trace-cross-thread.md) for more use cases.

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docs/en/FAQ/Protoc-Plugin-Fails-When-Build.md
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### Problem
- In maven build, the protoc-plugin occurs error:
- In maven build, the following error may occur with the protoc-plugin:
```
[ERROR] Failed to execute goal org.xolstice.maven.plugins:protobuf-maven-plugin:0.5.0:compile-custom (default) on project apm-network: Unable to copy the file to \skywalking\apm-network\target\protoc-plugins: \skywalking\apm-network\target\protoc-plugins\protoc-3.3.0-linux-x86_64.exe (The process cannot access the file because it is being used by another process) -> [Help 1]
```
### Reason
- Protobuf compiler is dependent on the glibc, but it is not-installed or installed old version in the system.
- The Protobuf compiler is dependent on the glibc. However, glibc has not been installed, or there is an old version already installed in the system.
### Resolve
- Install or upgrade to the latest version of the glibc library. In container env, recommend using the latest glibc version of the alpine system.
Please refer to http://www.gnu.org/software/libc/documentation.html
### Resolution
- Install or upgrade to the latest version of the glibc library. Under the container environment, the latest glibc version of the alpine system is recommended.
Please refer to http://www.gnu.org/software/libc/documentation.html.