Question

我在stanalone应用程序中使用Springboot + Spring JPA。但我正在跟踪错误：

引起：org.springframework.beans.BeanInstantiationException：无法实例化 [org.springframework.http.converter.StringHttpMessageConverter]：工厂方法＆＃39; stringHttpMessageConverter＆＃39;抛出异常;嵌套异常是java.lang.NullPointerException org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate（SimpleInstantiationStrategy.java:189）在 org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod（ConstructorResolver.java:588） ... 69更多引起：java.lang.NullPointerException at java.nio.charset.Charset.put（未知来源）at java.nio.charset.Charset.access $ 200（未知来源）at java.nio.charset.Charset $ 3.run（未知来源）at java.nio.charset.Charset $ 3.run（未知来源）at java.security.AccessController.doPrivileged（Native Method）at java.nio.charset.Charset.availableCharsets（未知来源）at org.springframework.http.converter.StringHttpMessageConverter。（StringHttpMessageConverter.java:67）在 org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration $ StringHttpMessageConverterConfiguration.stringHttpMessageConverter（HttpMessageConvertersAutoConfiguration.java:77）在 org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration $ StringHttpMessageConverterConfiguration $$ EnhancerBySpringCGLIB $$ 4ce1453d.CGLIB $ stringHttpMessageConverter $ 0（）在 org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration $ StringHttpMessageConverterConfiguration $$ EnhancerBySpringCGLIB $$ 4ce1453d $$ FastClassBySpringCGLIB $$ 1235f10b.invoke（）在 org.springframework.cglib.proxy.MethodProxy.invokeSuper（MethodProxy.java:228）在 org.springframework.context.annotation.ConfigurationClassEnhancer $ BeanMethodInterceptor.intercept（ConfigurationClassEnhancer.java:309）在 org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration $ StringHttpMessageConverterConfiguration $$ EnhancerBySpringCGLIB $$ 4ce1453d.stringHttpMessageConverter（） at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（未知来源）at sun.reflect.DelegatingMethodAccessorImpl.invoke（未知来源）at java.lang.reflect.Method.invoke（未知来源）at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate（SimpleInstantiationStrategy.java:162） ......还有70多个

我的Config课程如下：

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = {
        "com.automation.entity"
})
public class DataAccessPersistenceContext {

    @Bean
    public DataSource sybaseDataSource() {
        DataSource sybaseDataSource = new DataSource();
        try {
            sybaseDataSource.setDriverClassName("com.sybase.jdbc4.jdbc.SybDriver");
            sybaseDataSource.setUrl("jdbc:sybase:Tds:test.com:29812/TESTSCORE");
            sybaseDataSource.setUsername("testUser");
            String password = "user";
            sybaseDataSource.setPassword(password);
            sybaseDataSource.setInitialSize(Integer.parseInt("5"));
            sybaseDataSource.setMaxActive(Integer.parseInt("30"));
            sybaseDataSource.setMaxIdle(Integer.parseInt("2"));
            sybaseDataSource.setMinIdle(Integer.parseInt("2"));
            sybaseDataSource.setValidationQuery("SELECT 1");
            sybaseDataSource.setTestOnBorrow(Boolean.parseBoolean("true"));
            sybaseDataSource.setTestWhileIdle(Boolean.parseBoolean("true"));
        } catch (NumberFormatException e) {
            // log.error("Exception in CoreLocalConfig.
            // NumberFormatException:"+e);
        } catch (Exception e) {
            // log.error("Exception in CoreLocalConfig. Exception:"+e);
        }
        return sybaseDataSource;
    }

    @Bean
    @Qualifier("entityManagerFactory")
    LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource) {
        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactoryBean.setDataSource(dataSource);
        entityManagerFactoryBean.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
        entityManagerFactoryBean.setPackagesToScan("com.automation.entity");

        Properties jpaProperties = new Properties();

        //Configures the used database dialect. This allows Hibernate to create SQL
        //that is optimized for the used database.
        jpaProperties.put("hibernate.dialect", "org.hibernate.dialect.Sybase11Dialect");

        //Specifies the action that is invoked to the database when the Hibernate
        //SessionFactory is created or closed.
        jpaProperties.put("hibernate.hbm2ddl.auto", "create-drop");

        //Configures the naming strategy that is used when Hibernate creates
        //new database objects and schema elements
        jpaProperties.put("hibernate.ejb.naming_strategy", "org.hibernate.cfg.ImprovedNamingStrategy");

        //If the value of this property is true, Hibernate writes all SQL
        //statements to the console.
        jpaProperties.put("hibernate.show_sql", "true");

        //If the value of this property is true, Hibernate will format the SQL
        //that is written to the console.
        jpaProperties.put("hibernate.format_sql", "true");

        entityManagerFactoryBean.setJpaProperties(jpaProperties);

        return entityManagerFactoryBean;
    }

    @Bean
    JpaTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(entityManagerFactory);
        return transactionManager;
    }
}

你能帮我解决这个问题吗？

Answer 1

我已经通过将正确的jconnect4.jar文件添加到类路径

中来解决它

工厂方法＆＃39; stringHttpMessageConverter＆＃39;抛出异常;嵌套异常是java.lang.NullPointerException

1 个答案: