jdb远程调试gradle构建的java或j2ee项目.txt
:Author: kalipy
:Email: kalipy@debian
:Date: 2020-12-07 13:57
初级： 见我的仓库jdbshell
进阶(这里以debug mybatis项目为例):
//1.先以非debug模式运行下，能成功后再测试debug模式
java -cp build/classes/java/test:build/classes/java/main:kk:build/resources/main com.kuang.dao.UserDaoTest
//很不幸，以非debug模式运行失败,报错如下：
java.lang.ClassNotFoundException: org.apache.xxx
java.lang.ClassNotFoundException: xx.mysql.xxx
java.io.IOException: Could not find resource mybatis-config.xml
//解决：
mkdir kk
find .gradle/ -iname "*mysql*"//找到mysql.jar
cp ~/.gradle/caches/modules-2/files-2.1/mysql/mysql-connector-java/8.0.21/53fd3a0887667aae7e40a3439fff2d03d93ec4c2/mysql-connector-java-8.0.21.jar kk/.
cd kk
unzip mysql-connector-java-8.0.21.jar
find .gradle/ -iname "*mybatis*"//找到mybatis.jar
cp ~/.gradle/caches/modules-2/files-2.1/org.mybatis/mybatis/3.5.3/941d248365b461a853f0c29c32752a0a290224bb/mybatis-3.5.3.jar kk/.
cd kk
unzip mybatis-3.5.3.jar
//2.以debug方式运行.class程序
java -Xdebug -Xrunjdwp:transport=dt_socket,address=8888,server=y,suspend=y -cp build/classes/java/test:build/classes/java/main:kk:build/resources/main com.kuang.dao.UserDaoTest
//3.调试
./jdbshell -attach 8888 -sourcepath ~/bak2/j2ee_study/kuansen_mybatis/src/test/java
//4.给main函数下个断点
stop in com.kuang.dao.UserDaoTest.main
java参数说明：
-cp:指定.class文件的搜索路径(路径都是包的根目录) 若有多个路径，以:号分隔
build/classes/java/test gradle的test目录下的.java文件编译为.class文件后，.class文件的存放路径
build/classes/java/main gradle的main目录下的.java文件编译为.class文件后，.class文件的存放路径
build/resources/main gradle的src/main/resources目录下的.xml和.property等配置文件gradle build命令构建后,.xml和.property等配置文件的存放路径
jdb调试说明：
main[1] l
25 public static void main(String args[]) {
26 SqlSession sqlSession = MybatisUtils.getSqlSession();
27 TeacherMapper mapper = sqlSession.getMapper(TeacherMapper.class);
28 Teacher teacher = mapper.getTeacher(1);
29 => System.out.println("gg");
30 sqlSession.close();
31 }
32 }
33
dump sqlSession
sqlSession = {
configuration: instance of org.apache.ibatis.session.Configuration(id=1457)
executor: instance of org.apache.ibatis.executor.CachingExecutor(id=1458)
autoCommit: true
dirty: false
cursorList: null
}
//可见，sqlSession里的内容都折叠了，比如怎么看configuration里的详细内容，这样,即以.号展开instance里面的内容：
main[1] dump sqlSession.configuration
sqlSession.configuration = {
environment: instance of org.apache.ibatis.mapping.Environment(id=1961)
safeRowBoundsEnabled: false
safeResultHandlerEnabled: true
mapUnderscoreToCamelCase: false
aggressiveLazyLoading: false
multipleResultSetsEnabled: true
useGeneratedKeys: false
useColumnLabel: true
cacheEnabled: true
callSettersOnNulls: false
useActualParamName: true
returnInstanceForEmptyRow: false
logPrefix: null
logImpl: null
vfsImpl: null
localCacheScope: instance of org.apache.ibatis.session.LocalCacheScope(id=1962)
jdbcTypeForNull: instance of org.apache.ibatis.type.JdbcType(id=1963)
lazyLoadTriggerMethods: instance of java.util.HashSet(id=1964)
defaultStatementTimeout: null
defaultFetchSize: null
defaultResultSetType: null
defaultExecutorType: instance of org.apache.ibatis.session.ExecutorType(id=1965)
autoMappingBehavior: instance of org.apache.ibatis.session.AutoMappingBehavior(id=1966)
autoMappingUnknownColumnBehavior: instance of org.apache.ibatis.session.AutoMappingUnknownColumnBehavior$1(id=1967)
variables: instance of java.util.Properties(id=1968)
reflectorFactory: instance of org.apache.ibatis.reflection.DefaultReflectorFactory(id=1969)
objectFactory: instance of org.apache.ibatis.reflection.factory.DefaultObjectFactory(id=1970)
objectWrapperFactory: instance of org.apache.ibatis.reflection.wrapper.DefaultObjectWrapperFactory(id=1971)
lazyLoadingEnabled: false
proxyFactory: instance of org.apache.ibatis.executor.loader.javassist.JavassistProxyFactory(id=1972)
databaseId: null
configurationFactory: null
mapperRegistry: instance of org.apache.ibatis.binding.MapperRegistry(id=1973)
interceptorChain: instance of org.apache.ibatis.plugin.InterceptorChain(id=1974)
typeHandlerRegistry: instance of org.apache.ibatis.type.TypeHandlerRegistry(id=1975)
typeAliasRegistry: instance of org.apache.ibatis.type.TypeAliasRegistry(id=1976)
languageRegistry: instance of org.apache.ibatis.scripting.LanguageDriverRegistry(id=1977)
mappedStatements: instance of org.apache.ibatis.session.Configuration$StrictMap(id=1978)
caches: instance of org.apache.ibatis.session.Configuration$StrictMap(id=1979)
resultMaps: instance of org.apache.ibatis.session.Configuration$StrictMap(id=1980)
parameterMaps: instance of org.apache.ibatis.session.Configuration$StrictMap(id=1981)
keyGenerators: instance of org.apache.ibatis.session.Configuration$StrictMap(id=1982)
loadedResources: instance of java.util.HashSet(id=1983)
sqlFragments: instance of org.apache.ibatis.session.Configuration$StrictMap(id=1984)
incompleteStatements: instance of java.util.LinkedList(id=1985)
incompleteCacheRefs: instance of java.util.LinkedList(id=1986)
incompleteResultMaps: instance of java.util.LinkedList(id=1987)
incompleteMethods: instance of java.util.LinkedList(id=1988)
cacheRefMap: instance of java.util.HashMap(id=1989)
}
main[1] dump sqlSession.configuration.resultMaps
sqlSession.configuration.resultMaps = {
serialVersionUID: -4950446264854982944
name: "Result Maps collection"
conflictMessageProducer: null
java.util.HashMap.serialVersionUID: 362498820763181265
java.util.HashMap.DEFAULT_INITIAL_CAPACITY: 16
java.util.HashMap.MAXIMUM_CAPACITY: 1073741824
java.util.HashMap.DEFAULT_LOAD_FACTOR: 0.75
java.util.HashMap.TREEIFY_THRESHOLD: 8
java.util.HashMap.UNTREEIFY_THRESHOLD: 6
java.util.HashMap.MIN_TREEIFY_CAPACITY: 64
java.util.HashMap.table: instance of java.util.HashMap$Node[16] (id=1991)
java.util.HashMap.entrySet: null
java.util.HashMap.size: 2
java.util.HashMap.modCount: 2
java.util.HashMap.threshold: 12
java.util.HashMap.loadFactor: 0.75
java.util.AbstractMap.keySet: null
java.util.AbstractMap.values: null
}
该测试例子mybaits目录结构参考(注意：用junit单元测试也是一样的道理，但是要记得把junit.jar放到kk目录下解压后-cp加到classpath里):
kalipy@debian ~/b/j/kuansen_mybatis> tree src/ master!?
src/
├── main
│ ├── java
│ │ └── com
│ │ ├── App.java
│ │ └── kuang
│ │ ├── dao
│ │ │ ├── StudentMapper.java
│ │ │ └── TeacherMapper.java
│ │ ├── pojo
│ │ │ ├── Student.java
│ │ │ └── Teacher.java
│ │ └── utils
│ │ └── MybatisUtils.java
│ └── resources
│ ├── com
│ │ └── kuang
│ │ └── dao
│ │ ├── StudentMapper.xml
│ │ └── TeacherMapper.xml
│ ├── db.properties
│ ├── log4j.properties
│ └── mybatis-config.xml
└── test
├── java
│ └── com
│ ├── AppTest.java
│ └── kuang
│ └── dao
│ └── UserDaoTest.java
└── resources
--------------------------------------------------------------------------
kalipy@debian ~/b/j/kuansen_mybatis> tree build/classes master!?
build/classes
└── java
├── main
│ └── com
│ ├── App.class
│ └── kuang
│ ├── dao
│ │ ├── StudentMapper.class
│ │ └── TeacherMapper.class
│ ├── pojo
│ │ ├── Student.class
│ │ └── Teacher.class
│ └── utils
│ └── MybatisUtils.class
└── test
└── com
├── AppTest.class
└── kuang
└── dao
└── UserDaoTest.class
--------------------------------------------------------------------------
kalipy@debian ~/b/j/kuansen_mybatis> tree build/resources master!?
build/resources
└── main
├── com
│ └── kuang
│ ├── dao
│ │ ├── StudentMapper.xml
│ │ └── TeacherMapper.xml
│ ├── pojo
│ └── utils
├── db.properties
├── log4j.properties
└── mybatis-config.xml
--------------------------------------------------------------------------
kalipy@debian ~/b/j/kuansen_mybatis>
more src/test/java/com/kuang/dao/UserDaoTest.java
package com.kuang.dao;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.session.SqlSession;
import com.kuang.dao.TeacherMapper;
import com.kuang.pojo.Teacher;
import com.kuang.utils.MybatisUtils;
/*
* UserDaoTest.java
* Copyright (C) 2020 2020-12-05 21:31 kalipy <kalipy@debian>
*
* Distributed under terms of the MIT license.
*/
public class UserDaoTest
{
public static void main(String args[]) {
SqlSession sqlSession = MybatisUtils.getSqlSession();
TeacherMapper mapper = sqlSession.getMapper(TeacherMapper.class);
Teacher teacher = mapper.getTeacher(1);
System.out.println("gg");
sqlSession.close();
}
}
推荐用gradle，可以更简单:
gradle test --debug-jvm//debug单元测试 5005是gradle debug默认开的端口
jdbshell -attach 5005 -sourcepath ~/bak2/j2ee_study/kuansen_mybatis/src/test/java:/home/kalipy/bak2/j2ee_study/kuansen_mybatis/src/main/java:/home/kalipy/bak2/j2ee_study/kuansen_mybatis/gg