【发布时间】：2022-01-10 07:55:44
【问题描述】：
我需要创建一个可以打到数据库的胖罐子，并将获得的文件保存到服务器的目录中。服务器只能运行 Java 6 (1.6)。因此，我用这个 pom 创建了一个 spring 项目：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.2.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.app.newapp</groupId>
<artifactId>fileprocessing</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>editformpemrek</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.6</java.version>
<tomcat.version>7.0.59</tomcat.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
<exclusions>
<exclusion>
<groupId>javax.transaction</groupId>
<artifactId>javax.transaction-api</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.jboss.spec.javax.transaction</groupId>
<artifactId>jboss-transaction-api_1.2_spec</artifactId>
<version>1.0.0.Final</version>
</dependency>
<dependency>
<groupId>com.oracle.database.jdbc</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.4</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-juli</artifactId>
<version>${tomcat.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<repositories>
<repository>
<id>maven</id>
<url>https://repo1.maven.org/maven2</url>
</repository>
</repositories>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
那我把主类做成这样试试：
@SpringBootApplication
public class FormAssignmentApplication implements CommandLineRunner {
private static final Logger logger = Logger.getLogger("FormAssignmentApplication");
@Autowired
FormService service;
public static void main(String[] args) {
new SpringApplicationBuilder(FormAssignmentApplication.class)
.run(args);
}
@Override
public void run(String... args) throws Exception {
System.out.println(service.findAll());
}
}
这是我的服务：
@Service
public class FormService {
@Autowired
FormRepository formRepo;
public List<FormAssignment> findAll() {
return formRepo.findAll();
}
}
这是我的存储库：
public interface FormRepository extends JpaRepository<FormAssignment, Long> {
List<FormAssignment> findAll();
}
模型/实体/POJO 有这个形状：
package com.bca.oasys.editformpemrek.model;
import javax.persistence.*;
import java.sql.Timestamp;
@Entity
@Table(name = "ASSIGNMENT_FORM")
public class FormAssignment {
@Id
@Column(name = "id")
private Long id;
@Column(name = "student_id")
private String studentId;
@Column(name = "submitted_file")
private byte[] doc;
public String getStudentId() {
return studentId;
}
public void setStudentId(String studentId) {
this.studentId = studentId;
}
public byte[] getDoc() {
return doc;
}
public void setDoc(byte[] doc) {
this.doc = doc;
}
public void setId(Long id) {
this.id = id;
}
@Id
@GeneratedValue
public Long getId() {
return id;
}
}
在这种情况下，studentId 不是表中的 ID。
我在 Java 8 上正确运行了这类代码（除了 pom），然后我更改了依赖项以适应 Java 6，我得到了这个异常链：
Caused by: org.springframework.orm.jpa.JpaSystemException: could not execute query; nested exception is org.hibernate.exception.GenericJDBCException: could not execute query
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:310)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:221)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:417)
at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59)
at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodIntercceptor.invoke(CrudMethodMetadataPostProcessor.java:122)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at $Proxy46.findAll(Unknown Source)
at com.app.newapp.fileprocessing.service.FormService.findAll(FormService.java:22)
at com.app.newapp.fileprocessing.FormAssignmentApplication.run(FormAssignmentApplication.java:53)
at org.springframework.boot.SpringApplication.runCommandLineRunners(SpringApplication.java:672)
... 4 more
Caused by: org.hibernate.exception.GenericJDBCException: could not execute query
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
at org.hibernate.loader.Loader.doList(Loader.java:2557)
at org.hibernate.loader.Loader.doList(Loader.java:2540)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2370)
at org.hibernate.loader.Loader.list(Loader.java:2365)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:497)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:387)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:236)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1300)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:103)
at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:573)
at org.hibernate.jpa.internal.QueryImpl.getResultList(QueryImpl.java:449)
at org.hibernate.jpa.criteria.compile.CriteriaQueryTypeQueryAdapter.getResultList(CriteriaQueryTypeQueryAdapter.java:67)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.findAll(SimpleJpaRepository.java:291)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:416)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:401)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:373)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
... 14 more
Caused by: java.sql.SQLException: Fail to convert to internal representation
at oracle.jdbc.driver.CharCommonAccessor.getBoolean(CharCommonAccessor.java:185)
at oracle.jdbc.driver.T4CVarcharAccessor.getBoolean(T4CVarcharAccessor.java:794)
at oracle.jdbc.driver.OracleResultSetImpl.getBoolean(OracleResultSetImpl.java:640)
at oracle.jdbc.driver.OracleResultSet.getBoolean(OracleResultSet.java:390)
at org.hibernate.type.descriptor.sql.BitTypeDescriptor$2.doExtract(BitTypeDescriptor.java:75)
at org.hibernate.type.descriptor.sql.BasicExtractor.extract(BasicExtractor.java:64)
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:267)
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:263)
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:253)
at org.hibernate.type.AbstractStandardBasicType.hydrate(AbstractStandardBasicType.java:338)
at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2969)
at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1696)
at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1628)
at org.hibernate.loader.Loader.getRow(Loader.java:1515)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:726)
at org.hibernate.loader.Loader.processResultSet(Loader.java:953)
at org.hibernate.loader.Loader.doQuery(Loader.java:921)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:355)
at org.hibernate.loader.Loader.doList(Loader.java:2554)
... 39 more
我该怎么办？因为我在 Spring 中很新，而且我的 IDE 中没有任何错误。在检查错误的堆栈跟踪时，我也卡住了，找不到根本原因。我只是看到它无法执行findAll 查询，但我想知道我做错了什么。我还已经将数据库规范（连接字符串、用户名和密码）放在application.properties 中。问题是当我在 java 8 中尝试时，这段代码可以正常运行。非常感谢任何帮助。谢谢。
【问题讨论】：
-
Spring Boot 1.2 不支持 Java 16 或 Java 8 以上的任何版本。您的存储库中的
findAll也不需要，这已经是标准合同的一部分。 -
JDK 1.6 和 8 都过时了（尤其是 1.6），我建议你使用 JDK 17。同时使用最近的 springboot 版本。
-
@M.Deinum 适用于 Java 6，低于 Java 8。
-
@jewelsea 我知道，但是该服务器上的 java 版本无法升级，因为那里运行着许多旧版应用程序并且与较新的 Java 版本不兼容
-
你不能安装另一个 jdk 来独立于现有 jdk 和应用程序运行你的应用程序，或者使用 jpackage 将现代 jdk 包含在你的应用程序安装中而不影响现有的东西吗？我从未听说过只能运行 Java 1.6 的服务器。
标签： java spring spring-boot hibernate spring-data-jpa