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我正在尝试将我的网络应用程序部署到 heroku。由于 Heroku 不允许使用 Hibernate DB,我设置了一个 postgres 插件并尝试配置我的应用程序以使用它。
但是,当我部署我的应用程序时,它构建成功,但当我尝试打开该应用程序时,我收到应用程序错误。看起来 tomcat 服务器无法连接到 postgres 数据库,并且出于某种原因它看起来像是在尝试连接到本地主机。 Heroku 日志
位于本文底部。
DataConfig.java
@Configuration
public class DataConfig {
@Autowired
private Environment env;
@Bean
@Primary
@ConfigurationProperties(prefix = "newsitem.db")
public DataSource dataSource() {
BasicDataSource ds = new BasicDataSource();
ds.setDriverClassName(env.getProperty("newsitem.db.driver"));
ds.setUrl(env.getProperty("newsitem.db.url"));
ds.setUsername(env.getProperty("newsitem.db.username"));
ds.setPassword(env.getProperty("newsitem.db.password"));
return ds;
}
app.properties
newsitem.db.url=${JDBC_DATABASE_URL}
newsitem.db.driver=org.postgresql.Driver
newsitem.db.username=${JDBC_DATABASE_USERNAME}
newsitem.db.password=${JDBC_DATABASE_PASSWORD}
这似乎是失败的主要原因:
Caused by: org.h2.jdbc.JdbcSQLException: Connection is broken: "java.net.ConnectException: Connection refused (连接被拒绝): 本地主机"[90067-191]
Heroku 日志:
2017-05-03T04:32:52.564241+00:00 app[web.1]: at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.5.RELEASE.jar!/:4.3.5.RELEASE]
2017-05-03T04:32:52.564242+00:00 app[web.1]: at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.5.RELEASE.jar!/:4.3.5.RELEASE]
2017-05-03T04:32:52.564245+00:00 app[web.1]: at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.5.RELEASE.jar!/:4.3.5.RELEASE]
2017-05-03T04:32:52.564246+00:00 app[web.1]: at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.5.RELEASE.jar!/:4.3.5.RELEASE]
2017-05-03T04:32:52.564246+00:00 app[web.1]: at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.5.RELEASE.jar!/:4.3.5.RELEASE]
2017-05-03T04:32:52.564247+00:00 app[web.1]: at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.5.RELEASE.jar!/:4.3.5.RELEASE]
2017-05-03T04:32:52.564248+00:00 app[web.1]: at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:759) ~[spring-beans-4.3.5.RELEASE.jar!/:4.3.5.RELEASE]
2017-05-03T04:32:52.564249+00:00 app[web.1]: at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) ~[spring-context-4.3.5.RELEASE.jar!/:4.3.5.RELEASE]
2017-05-03T04:32:52.564250+00:00 app[web.1]: at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) ~[spring-context-4.3.5.RELEASE.jar!/:4.3.5.RELEASE]
2017-05-03T04:32:52.564250+00:00 app[web.1]: at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.4.3.RELEASE.jar!/:1.4.3.RELEASE]
2017-05-03T04:32:52.564251+00:00 app[web.1]: at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.3.RELEASE.jar!/:1.4.3.RELEASE]
2017-05-03T04:32:52.564252+00:00 app[web.1]: at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.3.RELEASE.jar!/:1.4.3.RELEASE]
2017-05-03T04:32:52.564253+00:00 app[web.1]: at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.3.RELEASE.jar!/:1.4.3.RELEASE]
2017-05-03T04:32:52.564253+00:00 app[web.1]: at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.3.RELEASE.jar!/:1.4.3.RELEASE]
2017-05-03T04:32:52.564254+00:00 app[web.1]: at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.3.RELEASE.jar!/:1.4.3.RELEASE]
2017-05-03T04:32:52.564255+00:00 app[web.1]: at com.doronzehavi.newsitemweb.Application.main(Application.java:16) [classes!/:na]
2017-05-03T04:32:52.564256+00:00 app[web.1]: at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_121-cedar14]
2017-05-03T04:32:52.564256+00:00 app[web.1]: at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_121-cedar14]
2017-05-03T04:32:52.564257+00:00 app[web.1]: at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_121-cedar14]
2017-05-03T04:32:52.564258+00:00 app[web.1]: at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_121-cedar14]
2017-05-03T04:32:52.564259+00:00 app[web.1]: at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) [newsitemweb-0.0.1-SNAPSHOT.jar:na]
2017-05-03T04:32:52.564279+00:00 app[web.1]: at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) [newsitemweb-0.0.1-SNAPSHOT.jar:na]
2017-05-03T04:32:52.564280+00:00 app[web.1]: at org.springframework.boot.loader.Launcher.launch(Launcher.java:50) [newsitemweb-0.0.1-SNAPSHOT.jar:na]
2017-05-03T04:32:52.564280+00:00 app[web.1]: at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51) [newsitemweb-0.0.1-SNAPSHOT.jar:na]
2017-05-03T04:32:52.564282+00:00 app[web.1]: Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.doronzehavi.newsitemweb.dao.NewsSourceDaoImpl]: Constructor threw exception; nested exception is javax.persistence.PersistenceException: Unable to build entity manager factory
2017-05-03T04:32:52.564282+00:00 app[web.1]: at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:154) ~[spring-beans-4.3.5.RELEASE.jar!/:4.3.5.RELEASE]
2017-05-03T04:32:52.564283+00:00 app[web.1]: at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89) ~[spring-beans-4.3.5.RELEASE.jar!/:4.3.5.RELEASE]
2017-05-03T04:32:52.564284+00:00 app[web.1]: at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1108) ~[spring-beans-4.3.5.RELEASE.jar!/:4.3.5.RELEASE]
2017-05-03T04:32:52.564285+00:00 app[web.1]: ... 25 common frames omitted
2017-05-03T04:32:52.564286+00:00 app[web.1]: Caused by: javax.persistence.PersistenceException: Unable to build entity manager factory
2017-05-03T04:32:52.564286+00:00 app[web.1]: at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:66) ~[hibernate-entitymanager-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564287+00:00 app[web.1]: at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:55) ~[hibernate-jpa-2.1-api-1.0.0.Final.jar!/:1.0.0.Final]
2017-05-03T04:32:52.564288+00:00 app[web.1]: at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:39) ~[hibernate-jpa-2.1-api-1.0.0.Final.jar!/:1.0.0.Final]
2017-05-03T04:32:52.564288+00:00 app[web.1]: at com.doronzehavi.newsitemweb.dao.NewsSourceDaoImpl.<init>(NewsSourceDaoImpl.java:23) ~[classes!/:na]
2017-05-03T04:32:52.564289+00:00 app[web.1]: at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_121-cedar14]
2017-05-03T04:32:52.564290+00:00 app[web.1]: at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_121-cedar14]
2017-05-03T04:32:52.564290+00:00 app[web.1]: at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_121-cedar14]
2017-05-03T04:32:52.564291+00:00 app[web.1]: at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_121-cedar14]
2017-05-03T04:32:52.564298+00:00 app[web.1]: at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:142) ~[spring-beans-4.3.5.RELEASE.jar!/:4.3.5.RELEASE]
2017-05-03T04:32:52.564299+00:00 app[web.1]: ... 27 common frames omitted
2017-05-03T04:32:52.564300+00:00 app[web.1]: Caused by: org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
2017-05-03T04:32:52.564300+00:00 app[web.1]: at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:264) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564301+00:00 app[web.1]: at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:228) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564302+00:00 app[web.1]: at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:207) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564302+00:00 app[web.1]: at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:51) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564303+00:00 app[web.1]: at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:94) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564304+00:00 app[web.1]: at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:237) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564304+00:00 app[web.1]: at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:207) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564306+00:00 app[web.1]: at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.handleTypes(MetadataBuildingProcess.java:352) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564307+00:00 app[web.1]: at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:111) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564311+00:00 app[web.1]: at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:847) ~[hibernate-entitymanager-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564312+00:00 app[web.1]: at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:874) ~[hibernate-entitymanager-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564312+00:00 app[web.1]: at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:58) ~[hibernate-entitymanager-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564313+00:00 app[web.1]: ... 35 common frames omitted
2017-05-03T04:32:52.564313+00:00 app[web.1]: Caused by: org.hibernate.exception.JDBCConnectionException: Error calling Driver#connect
2017-05-03T04:32:52.564314+00:00 app[web.1]: at org.hibernate.engine.jdbc.connections.internal.BasicConnectionCreator$1$1.convert(BasicConnectionCreator.java:105) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564315+00:00 app[web.1]: at org.hibernate.engine.jdbc.connections.internal.BasicConnectionCreator.convertSqlException(BasicConnectionCreator.java:123) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564315+00:00 app[web.1]: at org.hibernate.engine.jdbc.connections.internal.DriverConnectionCreator.makeConnection(DriverConnectionCreator.java:41) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564316+00:00 app[web.1]: at org.hibernate.engine.jdbc.connections.internal.BasicConnectionCreator.createConnection(BasicConnectionCreator.java:58) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564317+00:00 app[web.1]: at org.hibernate.engine.jdbc.connections.internal.PooledConnections.addConnections(PooledConnections.java:106) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564317+00:00 app[web.1]: at org.hibernate.engine.jdbc.connections.internal.PooledConnections.<init>(PooledConnections.java:40) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564318+00:00 app[web.1]: at org.hibernate.engine.jdbc.connections.internal.PooledConnections.<init>(PooledConnections.java:19) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564319+00:00 app[web.1]: at org.hibernate.engine.jdbc.connections.internal.PooledConnections$Builder.build(PooledConnections.java:138) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564319+00:00 app[web.1]: at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.buildPool(DriverManagerConnectionProviderImpl.java:110) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564320+00:00 app[web.1]: at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:74) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564321+00:00 app[web.1]: at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:94) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564322+00:00 app[web.1]: at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:237) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564323+00:00 app[web.1]: at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.buildJdbcConnectionAccess(JdbcEnvironmentInitiator.java:145) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564324+00:00 app[web.1]: at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:66) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564325+00:00 app[web.1]: at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564323+00:00 app[web.1]: at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:207) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564325+00:00 app[web.1]: at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:88) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564326+00:00 app[web.1]: at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:254) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564327+00:00 app[web.1]: ... 46 common frames omitted
2017-05-03T04:32:52.564327+00:00 app[web.1]: Caused by: org.h2.jdbc.JdbcSQLException: Connection is broken: "java.net.ConnectException: Connection refused (Connection refused): localhost" [90067-191]
2017-05-03T04:32:52.564334+00:00 app[web.1]: at org.h2.message.DbException.getJdbcSQLException(DbException.java:345) ~[h2-1.4.191.jar!/:na]
2017-05-03T04:32:52.564335+00:00 app[web.1]: at org.h2.message.DbException.get(DbException.java:168) ~[h2-1.4.191.jar!/:na]
2017-05-03T04:32:52.564340+00:00 app[web.1]: at org.h2.engine.SessionRemote.connectEmbeddedOrServer(SessionRemote.java:329) ~[h2-1.4.191.jar!/:na]
2017-05-03T04:32:52.564340+00:00 app[web.1]: at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:107) ~[h2-1.4.191.jar!/:na]
2017-05-03T04:32:52.564341+00:00 app[web.1]: at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:91) ~[h2-1.4.191.jar!/:na]
2017-05-03T04:32:52.564339+00:00 app[web.1]: at org.h2.engine.SessionRemote.connectServer(SessionRemote.java:452) ~[h2-1.4.191.jar!/:na]
2017-05-03T04:32:52.564341+00:00 app[web.1]: at org.h2.Driver.connect(Driver.java:72) ~[h2-1.4.191.jar!/:na]
2017-05-03T04:32:52.564343+00:00 app[web.1]: at org.hibernate.engine.jdbc.connections.internal.DriverConnectionCreator.makeConnection(DriverConnectionCreator.java:38) ~[hibernate-core-5.0.11.Final.jar!/:5.0.11.Final]
2017-05-03T04:32:52.564344+00:00 app[web.1]: ... 61 common frames omitted
2017-05-03T04:32:52.564344+00:00 app[web.1]: Caused by: java.net.ConnectException: Connection refused (Connection refused)
2017-05-03T04:32:52.564345+00:00 app[web.1]: at java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:1.8.0_121-cedar14]
2017-05-03T04:32:52.564346+00:00 app[web.1]: at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_121-cedar14]
2017-05-03T04:32:52.564347+00:00 app[web.1]: at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_121-cedar14]
2017-05-03T04:32:52.564347+00:00 app[web.1]: at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_121-cedar14]
2017-05-03T04:32:52.564348+00:00 app[web.1]: at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_121-cedar14]
2017-05-03T04:32:52.564349+00:00 app[web.1]: at org.h2.util.NetUtils.createSocket(NetUtils.java:122) ~[h2-1.4.191.jar!/:na]
2017-05-03T04:32:52.564349+00:00 app[web.1]: at org.h2.util.NetUtils.createSocket(NetUtils.java:102) ~[h2-1.4.191.jar!/:na]
2017-05-03T04:32:52.564346+00:00 app[web.1]: at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_121-cedar14]
2017-05-03T04:32:52.564350+00:00 app[web.1]: at org.h2.engine.SessionRemote.initTransfer(SessionRemote.java:114) ~[h2-1.4.191.jar!/:na]
2017-05-03T04:32:52.564350+00:00 app[web.1]: at org.h2.engine.SessionRemote.connectServer(SessionRemote.java:448) ~[h2-1.4.191.jar!/:na]
2017-05-03T04:32:52.564351+00:00 app[web.1]: ... 66 common frames omitted
2017-05-03T04:32:52.564351+00:00 app[web.1]:
2017-05-03T04:32:52.683659+00:00 heroku[web.1]: Process exited with status 1
2017-05-03T04:32:52.698197+00:00 heroku[web.1]: State changed from starting to crashed
2017-05-03T04:33:21.797903+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=intense-hamlet-29713.herokuapp.com request_id=9d7158ad-6410-49bd-83d0-c072f54fdc81 fwd="198.27.128.5" dyno= connect= service= status=503 bytes= protocol=https
2017-05-03T04:33:22.569682+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=intense-hamlet-29713.herokuapp.com request_id=2894c36e-db93-472e-9faf-553db67c84db fwd="198.27.128.5" dyno= connect= service= status=503 bytes= protocol=https
最佳答案
您正在使用 H2 数据库驱动程序。查看堆栈跟踪中的这一行:
org.h2.Driver.connect(Driver.java:72) ~[h2-1.4.191.jar!/:na]
使用正确的 jdbc 驱动程序。
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问题类似于this one ,但我想使用 OperatorPrecedenceParser 解析带有函数应用程序的表达式在 FParsec . 这是我的 AST: type Expression =
我想通过使用 sequelize 和 node.js 将这个查询更改为代码取决于在哪里 select COUNT(gender) as genderCount from customers where
我正在使用GNU bash,版本5.0.3(1)-发行版(x86_64-pc-linux-gnu),我想知道为什么简单的赋值语句会出现语法错误: #/bin/bash var1=/tmp
这里,为什么我的代码在 IE 中不起作用。我的代码适用于所有浏览器。没有问题。但是当我在 IE 上运行我的项目时,它发现错误。 而且我的 jquery 类和 insertadjacentHTMl 也不
我正在尝试更改标签的innerHTML。我无权访问该表单,因此无法编辑 HTML。标签具有的唯一标识符是“for”属性。 这是输入和标签的结构:
我有一个页面,我可以在其中返回用户帖子,可以使用一些 jquery 代码对这些帖子进行即时评论,在发布新评论后,我在帖子下插入新评论以及删除 按钮。问题是 Delete 按钮在新插入的元素上不起作用,
我有一个大约有 20 列的“管道分隔”文件。我只想使用 sha1sum 散列第一列,它是一个数字,如帐号,并按原样返回其余列。 使用 awk 或 sed 执行此操作的最佳方法是什么? Accounti
我需要将以下内容插入到我的表中...我的用户表有五列 id、用户名、密码、名称、条目。 (我还没有提交任何东西到条目中,我稍后会使用 php 来做)但由于某种原因我不断收到这个错误:#1054 - U
所以我试图有一个输入字段,我可以在其中输入任何字符,但然后将输入的值小写,删除任何非字母数字字符,留下“。”而不是空格。 例如,如果我输入: 地球的 70% 是水,-!*#$^^ & 30% 土地 输
我正在尝试做一些我认为非常简单的事情,但出于某种原因我没有得到想要的结果?我是 javascript 的新手,但对 java 有经验,所以我相信我没有使用某种正确的规则。 这是一个获取输入值、检查选择
我想使用 angularjs 从 mysql 数据库加载数据。 这就是应用程序的工作原理;用户登录,他们的用户名存储在 cookie 中。该用户名显示在主页上 我想获取这个值并通过 angularjs
我正在使用 autoLayout,我想在 UITableViewCell 上放置一个 UIlabel,它应该始终位于单元格的右侧和右侧的中心。 这就是我想要实现的目标 所以在这里你可以看到我正在谈论的
我需要与 MySql 等效的 elasticsearch 查询。我的 sql 查询: SELECT DISTINCT t.product_id AS id FROM tbl_sup_price t
我正在实现代码以使用 JSON。 func setup() { if let flickrURL = NSURL(string: "https://api.flickr.com/
我尝试使用for循环声明变量,然后测试cols和rols是否相同。如果是,它将运行递归函数。但是,我在 javascript 中执行 do 时遇到问题。有人可以帮忙吗? 现在,在比较 col.1 和
我举了一个我正在处理的问题的简短示例。 HTML代码: 1 2 3 CSS 代码: .BB a:hover{ color: #000; } .BB > li:after {
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