Java项目开启远程调试（tomcat、springboot）

当咱们运行一个项目的时候，通常都是在本地进行debug。可是若是是一个分布式的微服务，这时候咱们选择远程debug是咱们开发的利器。

环境
apache-tomcat-8.5.16

Linux

如何启用远程调试
tomcat开启远程调试
方法
切换到你的tomcat的bin目录/apache-tomcat-8.5.16/bin
下，执行:

./catalina.sh jpda start

执行上面的命令就能够开启远程debug了，若是想配置一些信息，好比端口号什么的，请参考下面的说明。

参数说明
# 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
操做说明
因此若是想修改配置，则以下操做：

在catalina.sh中进行配置：

JPDA_TRANSPORT=dt_socket JPDA_ADDRESS=5005 JPAD_SUSPEND=n

 

或者经过JPDA_OPTS进行配置：

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

 

springboot开启远程调试
远程调试maven设置

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 命令开启远程调试
在执行jar的时候，添加上参数。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调试，那么去看一下这个吧。深刻Java调试体系

问题
若是出现Connection refused。

首先检查一下端口8000的使用状况:

use:~/tomcat/logs # netstat -an|grep 8000
cp 0 0 127.0.0.1:8000 0.0.0.0:* LISTEN
可见当前16808端口服务被绑定了回环地址，外部没法访问。即本地调试。

办法：

修改catalina.sh中一个参数。

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

 

对JPDA_ADDRESS="localhost:8000" 把默认值（localhost:8000）改为0.0.0.0:8000。默认是本地ip调试也就是没法远程调试，0.0.0.0表示全部ip地址都能调试。

远程连上后再看端口状况：

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

 

断开后是这样的：

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链接远程端口进行远程debug
我已经在服务器上开启了远程调试，idea链接的步骤，直接上图。

edit configurations

 

远程调试配置

参数配置

将红框内的地址和端口号改为本身的。

 

启动远程调试

成功界面

 

请求一下试试

 

调试的姿式和本地调试同样，开始造起来吧！