Java項目開啓遠程調試（tomcat、springboot）

當咱們運行一個項目的時候，通常都是在本地進行debug。可是若是是一個分佈式的微服務，這時候咱們選擇遠程debug是咱們開發的利器。

環境
apache-tomcat-8.5.16

Linux

如何啓用遠程調試
tomcat開啓遠程調試
方法
切換到你的tomcat的bin目錄/apache-tomcat-8.5.16/bin
下，執行:

./catalina.sh jpda start

執行上面的命令就能夠開啓遠程debug了，若是想配置一些信息，好比端口號什麼的，請參考下面的說明。

參數說明
# JPDA_TRANSPORT (Optional) JPDA transport used when the "jpda start"
# command is executed. The default is "dt_socket".
#
# JPDA_ADDRESS (Optional) Java runtime options used when the "jpda start"
# command is executed. The default is localhost:8000.
#
# JPDA_SUSPEND (Optional) Java runtime options used when the "jpda start"
# command is executed. Specifies whether JVM should suspend
# execution immediately after startup. Default is "n".
#
# JPDA_OPTS (Optional) Java runtime options used when the "jpda start"
# command is executed. If used, JPDA_TRANSPORT, JPDA_ADDRESS,
# and JPDA_SUSPEND are ignored. Thus, all required jpda
# options MUST be specified. The default is:
#
# -agentlib:jdwp=transport=$JPDA_TRANSPORT,
# address=$JPDA_ADDRESS,server=y,suspend=$JPDA_SUSPEND
操做說明
因此若是想修改配置，則以下操做：

在catalina.sh中進行配置：

JPDA_TRANSPORT=dt_socket JPDA_ADDRESS=5005 JPAD_SUSPEND=n

 

或者經過JPDA_OPTS進行配置：

JPDA_OPTS='-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005’

 

springboot開啓遠程調試
遠程調試maven設置

The run goal forks a process for the boot application. It is possible to specify jvm arguments to that forked process. The following configuration suspend the process until a debugger has joined on port 5005

<project> ... <build> ... <plugins> ... <plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>1.1.12.RELEASE</version>
<configuration>
<jvmArguments> -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5005 </jvmArguments>
</configuration> ... </plugin> ... </plugins> ... </build> ... </project>

 

These arguments can be specified on the command line as well, make sure to wrap that properly, that is:

mvn spring-boot:run -Drun.jvmArguments="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5005"

 

jar 命令開啓遠程調試
在執行jar的時候，添加上參數。以下：

java -Xdebug -Xrunjdwp:server=y,transport=dt_socket,address=8000,suspend=n -jar demo.jar

 

若是想深刻了解Java調試，那麼去看一下這個吧。深刻Java調試體系

問題
若是出現Connection refused。

首先檢查一下端口8000的使用狀況:

use:~/tomcat/logs # netstat -an|grep 8000
cp 0 0 127.0.0.1:8000 0.0.0.0:* LISTEN
可見當前16808端口服務被綁定了迴環地址，外部沒法訪問。即本地調試。

辦法：

修改catalina.sh中一個參數。

if [ -z "$JPDA_TRANSPORT" ]; then JPDA_TRANSPORT="dt_socket" fi if [ -z "$JPDA_ADDRESS" ]; then JPDA_ADDRESS="0.0.0.0:8000" fi if [ -z "$JPDA_SUSPEND" ]; then JPDA_SUSPEND="n" fi

 

對JPDA_ADDRESS="localhost:8000" 把默認值（localhost:8000）改爲0.0.0.0:8000。默認是本地ip調試也就是沒法遠程調試，0.0.0.0表示全部ip地址都能調試。

遠程連上後再看端口狀況：

root@VM-198-217-ubuntu:/opt/apache-tomcat-8.5.16/bin# netstat -an | grep 8000
tcp 0 0 10.133.198.217:8000 60.177.99.27:49998 ESTABLISHED

 

斷開後是這樣的：

root@VM-198-217-ubuntu:/opt/apache-tomcat-8.5.16/bin# netstat -an | grep 8000
tcp 0 0 0.0.0.0:8000 0.0.0.0:* LISTEN tcp 0 0 10.133.198.217:8000 60.177.99.27:49998 TIME_WAIT

 

idea鏈接遠程端口進行遠程debug
我已經在服務器上開啓了遠程調試，idea鏈接的步驟，直接上圖。

edit configurations

 

遠程調試配置

參數配置

將紅框內的地址和端口號改爲本身的。

 

啓動遠程調試

成功界面

 

請求一下試試

 

調試的姿式和本地調試同樣，開始造起來吧！