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我是Spring的新手，我試圖用它來開發Web應用程序。當我需要連接到一個Sybase數據庫我的應用程序，我必須在我的構建路徑中包含jconn4.jar。然而，我將jconn4.jar添加到我的構建路徑後，我一直得到低於NullPointerException。當在構建路徑中添加jconn4.jar時引發NullPointerException異常
2016-09-30 14:15:48.116 INFO 74768 --- [ main] m.j.a.SpringBootPractice : No active profile set, falling back to default profiles: default
2016-09-30 14:15:48.116 DEBUG 74768 --- [ main] o.s.boot.SpringApplication : Loading source class main.java.appstarter.SpringBootPractice
2016-09-30 14:15:48.160 INFO 74768 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot[email protected]1a1e9a9: startup date [Fri Sep 30 14:15:48 EDT 2016]; root of context hierarchy
2016-09-30 14:15:48.162 DEBUG 74768 --- [ main] ationConfigEmbeddedWebApplicationContext : Bean factory for org.springframework.boot[email protected]1a1e9a9: org.s[email protected]10ee7e5: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.context.annotation.internalPersistenceAnnotationProcessor,org.springframework.context.event.internalEventListenerProcessor,org.springframework.context.event.internalEventListenerFactory,SpringBootPractice]; root of factory hierarchy
2016-09-30 14:15:48.975 DEBUG 74768 --- [ main] o.s.b.a.AutoConfigurationPackages : @EnableAutoConfiguration was declared on a class in the package 'main.java.appstarter'. Automatic @Repository and @Entity scanning is enabled.
2016-09-30 14:15:49.252 INFO 74768 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [class org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$d55d155b] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2016-09-30 14:15:49.291 DEBUG 74768 --- [ main] ationConfigEmbeddedWebApplicationContext : Unable to locate MessageSource with name 'messageSource': using default [[email protected]d8]
2016-09-30 14:15:49.291 DEBUG 74768 --- [ main] ationConfigEmbeddedWebApplicationContext : Unable to locate ApplicationEventMulticaster with name 'applicationEventMulticaster': using default [org.[email protected]145e7b9]
2016-09-30 14:15:49.622 DEBUG 74768 --- [ main] .t.TomcatEmbeddedServletContainerFactory : Code archive: C:\Users\.m2\repository\org\springframework\boot\spring-boot\1.4.1.RELEASE\spring-boot-1.4.1.RELEASE.jar
2016-09-30 14:15:49.622 DEBUG 74768 --- [ main] .t.TomcatEmbeddedServletContainerFactory : Code archive: C:\Users\.m2\repository\org\springframework\boot\spring-boot\1.4.1.RELEASE\spring-boot-1.4.1.RELEASE.jar
2016-09-30 14:15:49.623 DEBUG 74768 --- [ main] .t.TomcatEmbeddedServletContainerFactory : None of the document roots [src/main/webapp, public, static] point to a directory and will be ignored.
2016-09-30 14:15:49.656 WARN 74768 --- [ main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is java.lang.ExceptionInInitializerError
2016-09-30 14:15:49.664 ERROR 74768 --- [ main] o.s.boot.SpringApplication : Application startup failed
org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is java.lang.ExceptionInInitializerError
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:137) ~[spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:535) ~[spring-context-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at main.java.appstarter.SpringBootPractice.main(SpringBootPractice.java:19) [bin/:na]
Caused by: java.lang.ExceptionInInitializerError: null
at org.apache.tomcat.util.buf.UDecoder.URLDecode(UDecoder.java:352) ~[tomcat-embed-core-8.5.5.jar:8.5.5]
at org.apache.tomcat.util.buf.UDecoder.URLDecode(UDecoder.java:324) ~[tomcat-embed-core-8.5.5.jar:8.5.5]
at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3113) ~[tomcat-embed-core-8.5.5.jar:8.5.5]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.addServletMapping(TomcatEmbeddedServletContainerFactory.java:277) ~[spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.addDefaultServlet(TomcatEmbeddedServletContainerFactory.java:257) ~[spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.prepareContext(TomcatEmbeddedServletContainerFactory.java:213) ~[spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.getEmbeddedServletContainer(TomcatEmbeddedServletContainerFactory.java:176) ~[spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:164) ~[spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:134) ~[spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
... 8 common frames omitted
Caused by: java.lang.NullPointerException: null
at java.nio.charset.Charset.put(Charset.java:538) ~[na:1.8.0_51]
at java.nio.charset.Charset.access$200(Charset.java:271) ~[na:1.8.0_51]
at java.nio.charset.Charset$3.run(Charset.java:584) ~[na:1.8.0_51]
at java.nio.charset.Charset$3.run(Charset.java:573) ~[na:1.8.0_51]
at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_51]
at java.nio.charset.Charset.availableCharsets(Charset.java:572) ~[na:1.8.0_51]
at org.apache.tomcat.util.buf.B2CConverter.<clinit>(B2CConverter.java:49) ~[tomcat-embed-core-8.5.5.jar:8.5.5]
... 17 common frames omitted
我一直在尋找在所有相關的Q/A，發現這其中的一個可能的原因如下鏈接：NullPointerException thrown by Charset.availableCharsets due to our Sybase JDBC driver
，但我沒有看到任何提示了這種解決方案的任何。
我一直在嘗試很多可能性，但只要將它添加到構建路徑中，就會發生此異常。這阻止了我繼續前進。
下面是我的pox.xml：
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.1.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.jayway.jsonpath</groupId>
<artifactId>json-path</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
</properties>
配置數據庫
spring.datasource.driver-class-name=com.sybase.jdbc4.jdbc.SybDriver
任何人都可以幫助我在此或提供任何建議，我怎麼能繼續嗎？
任何輸入將非常感激。