与xmlparserv2冲突。尝试这个 ：
<dependency><groupId>com.oracle.jdbc</groupId><artifactId>ojdbc7</artifactId><version>12.1.0.2</version><exclusions> <exclusion> <groupId>com.oracle.jdbc</groupId> <artifactId>xmlparserv2</artifactId> </exclusion></exclusions> </dependency>解决方法
使用嵌入式tomcat运行spring-boot应用程序时收到错误（尚未尝试使用服务器tomcat）。
java.lang.IllegalStateException: Tomcat 7 reflection failed at org.springframework.boot.context.embedded.tomcat.SkipPatternJarScanner.scan(SkipPatternJarScanner.java:77) at org.apache.catalina.startup.TldConfig.execute(TldConfig.java:271) at org.apache.catalina.startup.TldConfig.lifecycleEvent(TldConfig.java:590) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5522) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1571) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1561) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:748)Caused by: java.lang.reflect.InvocationTargetException: null at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.boot.context.embedded.tomcat.SkipPatternJarScanner.scan(SkipPatternJarScanner.java:73) ... 12 common frames omittedCaused by: java.lang.NoClassDefFoundError: oracle/i18n/util/LocaleMapper at oracle.xml.parser.v2.XMLReader.setEncoding(XMLReader.java:980) at oracle.xml.parser.v2.XMLReader.checkXMLDecl(XMLReader.java:3284) at oracle.xml.parser.v2.XMLReader.pushXMLReader(XMLReader.java:570) at oracle.xml.parser.v2.XMLReader.pushXMLReader(XMLReader.java:274) at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:232) at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1576) at org.apache.catalina.startup.TldConfig.tldScanStream(TldConfig.java:565) at org.apache.catalina.startup.TldConfig.tldScanJar(TldConfig.java:513) at org.apache.catalina.startup.TldConfig.access$200(TldConfig.java:61) at org.apache.catalina.startup.TldConfig$TldJarScannerCallback.scan(TldConfig.java:300) at org.apache.tomcat.util.scan.StandardJarScanner.process(StandardJarScanner.java:259) at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:221) ... 17 common frames omittedCaused by: java.lang.ClassNotFoundException: oracle.i18n.util.LocaleMapper at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 29 common frames omitted
经过进一步检查，似乎由ojdbc7 maven dep依赖的orai18n.jar的先前版本在vesion11.2.0.3中包含了此类，但较新的（12.1.0.2）文件不包含该类。
