Activiti之H2

//by yan 20211229

H2数据库误删Saved Settings

装上H2数据库后，操作失误，把Saved Settings列表里面的项目删除了，并进行了保存。想要恢复原设置的时候，发现卸载后重装也不行。

解决方法：
删除 ~/.h2.server.properties文件，重装H2即可

注意：
找不到路径的同学搜索“h2.server.properties”。
~应该是指就是操作系统当前用户的目录自行baidu 【~】的含义。

H2的运行方式

一、在内存中运行
数据库只在内存中运行，关闭连接后数据库将被清空，适合测试环境
连接字符串：
jdbc:h2:mem:DBName;DB_CLOSE_DELAY=-1
如果不指定DBName，则以私有方式启动，只允许一个连接
二、嵌入式
数据库持久化存储为单个文件
连接字符串：
jdbc:h2:file:~/.h2/DBName;AUTO_SERVER=TRUE
~/.h2/DBName表示数据库文件的存储位置，如果第一次连接则会自动创建数据库。
严格来说应该叫文件方式连接，因为文件方式启动不需要先启动数据库服务器，直接在连接URL中填写绝对或相对路径即可，由于创建数据库连接时，H2引擎发现指定的路径下如果不存在数据库，则会自动创建。
三、服务模式
H2支持三种服务模式：
1.web server：此种运行方式支持使用浏览器访问H2 Console
2.TCP server：支持客户端/服务器端的连接方式
3.PG server：支持PostgreSQL客户端
启动tcp服务连接字符串示例：
jdbc:h2:tcp://localhost/~/test 使用用户主目录
jdbc:h2:tcp://localhost//data/test 使用绝对路径
四、连接字符串参数
1.DB_CLOSE_DELAY：要求最后一个正在连接的连接断开后，不要关闭数据库
2.MODE=MySQL：兼容模式，H2兼容多种数据库，该值可以为：DB2、Derby、HSQLDB、MSSQLServer、MySQL、Oracle、PostgreSQL
3.AUTO_RECONNECT=TRUE：连接丢失后自动重新连接
4.AUTO_SERVER=TRUE：启动自动混合模式，允许开启多个连接，该参数不支持在内存中运行模式
5.TRACE_LEVEL_SYSTEM_OUT、TRACE_LEVEL_FILE：输出跟踪日志到控制台或文件，取值0为OFF，1为ERROR（默认值），2为INFO，3为DEBUG
6.SET TRACE_MAX_FILE_SIZE mb：设置跟踪日志文件的大小，默认为16M
五、启动服务模式，打开H2 Console web页面
启动服务，在命令行中执行
java -cp h2*.jar org.h2.tools.Server
执行如下命令，获取选项列表及默认值
java -cp h2*.jar org.h2.tools.Server -?
常见的选项如下：
-web：启动支持H2 Console的服务
-webPort ：服务启动端口，默认为8082
-browser：启动H2 Console web管理页面
-tcp：使用TCP server模式启动
-pg：使用PG server模式启动

Activiti里的测试用例与h2数据库

Activiti里的测试用例创建的h2数据库看不到

JPAVariableTest
JPAEnhancedVariableTest

Activiti里的测试用例创建的h2数据库看不到，不知为何？
打了断点，到创建表的代码，确定连接都一致。就是看不到创建的表出来。

原因跟H2的运行方式有关。

将几个数据源连接配置修改一下：

再跑下JPAVariableTest，就可以看到数据库表了。

可是又有新问题：activiti-jpa数据库可以看到，但是activiti和JpaVariableTest数据库怎么都看不到表。好奇怪？？

改成服务器连接模式也不行：

//D:\git\Activiti\activiti-core\activiti-engine\src\test\resources\activiti.cfg.xml
<property name="jdbcUrl" value="jdbc:h2:tcp://localhost/~/.h2/db/activiti;AUTO_SERVER=TRUE" />//D:\git\Activiti\activiti-core\activiti-engine\src\test\resources\org\activiti\standalone\jpa\activiti.cfg.xml<property name="jdbcUrl" value="jdbc:h2:tcp://localhost/~/.h2/db/JpaVariableTest;AUTO_SERVER=TRUE" />//D:\git\Activiti\activiti-core\activiti-engine\src\test\resources\META-INF\persistence.xml<property name="javax.persistence.jdbc.url" value="jdbc:h2:tcp://localhost/~/.h2/db/activiti-jpa;AUTO_SERVER=TRUE" />

直接JPAVariableTest跑不过，而且只有activiti-jpa能创建成功，其它两个都创建不成功。

08:15:03 [main] ERROR org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl  - Exception while initializing Database connection
org.h2.jdbc.JdbcSQLNonTransientConnectionException: Database "C:/Users/YY/.h2/db/JpaVariableTest" not found, either pre-create it or allow remote database creation (not recommended in secure environments) [90149-200]at org.h2.message.DbException.getJdbcSQLException(DbException.java:622)at org.h2.engine.SessionRemote.done(SessionRemote.java:611)at org.h2.engine.SessionRemote.initTransfer(SessionRemote.java:147)at org.h2.engine.SessionRemote.connectServer(SessionRemote.java:435)at org.h2.engine.SessionRemote.connectEmbeddedOrServer(SessionRemote.java:321)at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:173)at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:152)at org.h2.Driver.connect(Driver.java:69)at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:681)at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:190)at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:201)at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:196)at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.getConnection(UnpooledDataSource.java:93)at org.apache.ibatis.datasource.pooled.PooledDataSource.popConnection(PooledDataSource.java:403)at org.apache.ibatis.datasource.pooled.PooledDataSource.getConnection(PooledDataSource.java:89)at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.initDatabaseType(ProcessEngineConfigurationImpl.java:1128)at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.initDataSource(ProcessEngineConfigurationImpl.java:1078)at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.init(ProcessEngineConfigurationImpl.java:865)at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.buildProcessEngine(ProcessEngineConfigurationImpl.java:848)at org.activiti.standalone.jpa.JPAVariableTest.initializeProcessEngine(JPAVariableTest.java:76)at org.activiti.engine.impl.test.AbstractActivitiTestCase.runBare(AbstractActivitiTestCase.java:89)at junit.framework.TestResult$1.protect(TestResult.java:122)at junit.framework.TestResult.runProtected(TestResult.java:142)at junit.framework.TestResult.run(TestResult.java:125)at junit.framework.TestCase.run(TestCase.java:129)at junit.framework.TestSuite.runTest(TestSuite.java:252)at junit.framework.TestSuite.run(TestSuite.java:247)at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:86)at org.junit.runner.JUnitCore.run(JUnitCore.java:137)at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.base/java.lang.reflect.Method.invoke(Method.java:568)at com.intellij.rt.execution.application.AppMainV2.main(AppMainV2.java:131)
08:15:04 [main] INFO  org.hibernate.jpa.internal.util.LogHelper  - HHH000204: Processing PersistenceUnitInfo [name: activiti-jpa-pu...]
08:15:04 [main] INFO  org.hibernate.Version  - HHH000412: Hibernate Core {5.3.15.Final}Hibernate: create table SHORT_ID_ENTITY (ID_ smallint not null, primary key (ID_))
Hibernate: create table SQLDATE_ID_ENTITY (ID_ date not null, primary key (ID_))
Hibernate: create table STRING_ID_ENTITY (ID_ varchar(255) not null, primary key (ID_))
08:15:05 [main] INFO  org.hibernate.tool.schema.internal.SchemaCreatorImpl  - HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl@240f350a'
08:15:05 [main] INFO  bitronix.tm.BitronixTransactionManager  - Bitronix Transaction Manager version 2.1.4
08:15:05 [main] INFO  bitronix.tm.Configuration  - JVM unique ID: <activiti-spring-btm>
08:15:05 [main] INFO  bitronix.tm.recovery.Recoverer  - recovery committed 0 dangling transaction(s) and rolled back 0 aborted transaction(s) on 0 resource(s) [] (restricted to serverId 'activiti-spring-btm')
08:15:05 [main] ERROR org.activiti.engine.impl.interceptor.CommandContext  - Error while closing command context
org.activiti.engine.ActivitiException: couldn't check if tables are already present using metadata:
### Error getting a new connection.  Cause: org.h2.jdbc.JdbcSQLNonTransientConnectionException: Database "C:/Users/YY/.h2/db/JpaVariableTest" not found, either pre-create it or allow remote database creation (not recommended in secure environments) [90149-204]at org.h2.message.DbException.getJdbcSQLException(DbException.java:697)at org.h2.message.DbException.getJdbcSQLException(DbException.java:496)at org.h2.message.DbException.get(DbException.java:227)at org.h2.message.DbException.get(DbException.java:203)at org.h2.engine.Engine.throwNotFound(Engine.java:189)at org.h2.engine.Engine.openSession(Engine.java:72)at org.h2.engine.Engine.openSession(Engine.java:222)at org.h2.engine.Engine.createSession(Engine.java:201)at org.h2.server.TcpServerThread.run(TcpServerThread.java:175)at java.lang.Thread.run(Unknown Source)### Cause: org.h2.jdbc.JdbcSQLNonTransientConnectionException: Database "C:/Users/YY/.h2/db/JpaVariableTest" not found, either pre-create it or allow remote database creation (not recommended in secure environments) [90149-204]at org.h2.message.DbException.getJdbcSQLException(DbException.java:697)at org.h2.message.DbException.getJdbcSQLException(DbException.java:496)at org.h2.message.DbException.get(DbException.java:227)at org.h2.message.DbException.get(DbException.java:203)at org.h2.engine.Engine.throwNotFound(Engine.java:189)at org.h2.engine.Engine.openSession(Engine.java:72)at org.h2.engine.Engine.openSession(Engine.java:222)at org.h2.engine.Engine.createSession(Engine.java:201)at org.h2.server.TcpServerThread.run(TcpServerThread.java:175)at java.lang.Thread.run(Unknown Source)at org.activiti.engine.impl.db.DbSqlSession.isTablePresent(DbSqlSession.java:1183)at org.activiti.engine.impl.db.DbSqlSession.isEngineTablePresent(DbSqlSession.java:1124)at org.activiti.engine.impl.db.DbSqlSession.dbSchemaUpdate(DbSqlSession.java:1046)at org.activiti.engine.impl.db.DbSqlSession.performSchemaOperationsProcessEngineBuild(DbSqlSession.java:1454)at org.activiti.engine.impl.SchemaOperationsProcessEngineBuild.execute(SchemaOperationsProcessEngineBuild.java:28)at org.activiti.engine.impl.interceptor.CommandInvoker$1.run(CommandInvoker.java:36)at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperation(CommandInvoker.java:77)at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperations(CommandInvoker.java:56)at org.activiti.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:41)at org.activiti.engine.impl.interceptor.TransactionContextInterceptor.execute(TransactionContextInterceptor.java:48)at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:59)at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:29)at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:44)at org.activiti.engine.impl.ProcessEngineImpl.<init>(ProcessEngineImpl.java:68)at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.buildProcessEngine(ProcessEngineConfigurationImpl.java:849)at org.activiti.standalone.jpa.JPAVariableTest.initializeProcessEngine(JPAVariableTest.java:76)at org.activiti.engine.impl.test.AbstractActivitiTestCase.runBare(AbstractActivitiTestCase.java:89)at junit.framework.TestResult$1.protect(TestResult.java:122)at junit.framework.TestResult.runProtected(TestResult.java:142)at junit.framework.TestResult.run(TestResult.java:125)at junit.framework.TestCase.run(TestCase.java:129)at junit.framework.TestSuite.runTest(TestSuite.java:252)at junit.framework.TestSuite.run(TestSuite.java:247)at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:86)at org.junit.runner.JUnitCore.run(JUnitCore.java:137)at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.base/java.lang.reflect.Method.invoke(Method.java:568)at com.intellij.rt.execution.application.AppMainV2.main(AppMainV2.java:131)
Caused by: org.apache.ibatis.exceptions.PersistenceException:
### Error getting a new connection.  Cause: org.h2.jdbc.JdbcSQLNonTransientConnectionException: Database "C:/Users/YY/.h2/db/JpaVariableTest" not found, either pre-create it or allow remote database creation (not recommended in secure environments) [90149-204]at org.h2.message.DbException.getJdbcSQLException(DbException.java:697)at org.h2.message.DbException.getJdbcSQLException(DbException.java:496)at org.h2.message.DbException.get(DbException.java:227)at org.h2.message.DbException.get(DbException.java:203)at org.h2.engine.Engine.throwNotFound(Engine.java:189)at org.h2.engine.Engine.openSession(Engine.java:72)at org.h2.engine.Engine.openSession(Engine.java:222)at org.h2.engine.Engine.createSession(Engine.java:201)at org.h2.server.TcpServerThread.run(TcpServerThread.java:175)at java.lang.Thread.run(Unknown Source)### Cause: org.h2.jdbc.JdbcSQLNonTransientConnectionException: Database "C:/Users/YY/.h2/db/JpaVariableTest" not found, either pre-create it or allow remote database creation (not recommended in secure environments) [90149-204]at org.h2.message.DbException.getJdbcSQLException(DbException.java:697)at org.h2.message.DbException.getJdbcSQLException(DbException.java:496)at org.h2.message.DbException.get(DbException.java:227)at org.h2.message.DbException.get(DbException.java:203)at org.h2.engine.Engine.throwNotFound(Engine.java:189)at org.h2.engine.Engine.openSession(Engine.java:72)at org.h2.engine.Engine.openSession(Engine.java:222)at org.h2.engine.Engine.createSession(Engine.java:201)at org.h2.server.TcpServerThread.run(TcpServerThread.java:175)at java.lang.Thread.run(Unknown Source)at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)at org.apache.ibatis.session.defaults.DefaultSqlSession.getConnection(DefaultSqlSession.java:300)at org.activiti.engine.impl.db.DbSqlSession.isTablePresent(DbSqlSession.java:1140)... 33 common frames omitted
Caused by: org.h2.jdbc.JdbcSQLNonTransientConnectionException: Database "C:/Users/YY/.h2/db/JpaVariableTest" not found, either pre-create it or allow remote database creation (not recommended in secure environments) [90149-200]at org.h2.message.DbException.getJdbcSQLException(DbException.java:622)at org.h2.engine.SessionRemote.done(SessionRemote.java:611)at org.h2.engine.SessionRemote.initTransfer(SessionRemote.java:147)at org.h2.engine.SessionRemote.connectServer(SessionRemote.java:435)at org.h2.engine.SessionRemote.connectEmbeddedOrServer(SessionRemote.java:321)at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:173)at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:152)at org.h2.Driver.connect(Driver.java:69)at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:681)at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:190)at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:201)at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:196)at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.getConnection(UnpooledDataSource.java:93)at org.apache.ibatis.datasource.pooled.PooledDataSource.popConnection(PooledDataSource.java:403)at org.apache.ibatis.datasource.pooled.PooledDataSource.getConnection(PooledDataSource.java:89)at org.apache.ibatis.transaction.jdbc.JdbcTransaction.openConnection(JdbcTransaction.java:138)at org.apache.ibatis.transaction.jdbc.JdbcTransaction.getConnection(JdbcTransaction.java:60)at org.apache.ibatis.session.defaults.DefaultSqlSession.getConnection(DefaultSqlSession.java:298)... 34 common frames omitted

报错原因：

以上图其实也不是原因。
分析下报错堆栈，你是另外两个数据库没办法自动创建。我于是想给它手动创建创建。
h2手动创建好很坑，用jdbc:h2:tcp:的方式登录不上，只能用jdbc:h2:file:的方式可以自动创建：

生成文件后再用jdbc:h2:tcp:方式登录就可以进去了。而且JPAVariableTest也成功跑通。idea 也能成功边上各个数据库了。

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