错误如下 :

15:01:57.051 [restartedMain] WARN  o.a.t.util.scan.StandardJarScanner - Failed to scan [file:/Users/cgh/.m2/repository/com/lowagie/itext/2.1.5/bcprov-jdk14-138.jar] from classloader hierarchy
java.io.FileNotFoundException: /Users/cgh/.m2/repository/com/lowagie/itext/2.1.5/bcprov-jdk14-138.jar (No such file or directory)at java.util.zip.ZipFile.open(Native Method)at java.util.zip.ZipFile.<init>(ZipFile.java:225)at java.util.zip.ZipFile.<init>(ZipFile.java:155)at java.util.jar.JarFile.<init>(JarFile.java:166)at java.util.jar.JarFile.<init>(JarFile.java:130)at org.apache.tomcat.util.compat.JreCompat.jarFileNewInstance(JreCompat.java:176)at org.apache.tomcat.util.scan.JarFileUrlJar.<init>(JarFileUrlJar.java:65)at org.apache.tomcat.util.scan.JarFactory.newInstance(JarFactory.java:49)at org.apache.tomcat.util.scan.StandardJarScanner.process(StandardJarScanner.java:374)at org.apache.tomcat.util.scan.StandardJarScanner.processURLs(StandardJarScanner.java:309)at org.apache.tomcat.util.scan.StandardJarScanner.doScanClassPath(StandardJarScanner.java:266)at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:229)at org.apache.jasper.servlet.TldScanner.scanJars(TldScanner.java:262)at org.apache.jasper.servlet.TldScanner.scan(TldScanner.java:104)at org.apache.jasper.servlet.JasperInitializer.onStartup(JasperInitializer.java:83)at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5132)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)at java.util.concurrent.FutureTask.run(FutureTask.java)at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)at java.util.concurrent.FutureTask.run(FutureTask.java)at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:932)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)at org.apache.catalina.startup.Tomcat.start(Tomcat.java:456)at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:105)at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:86)at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:414)at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:178)at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:179)at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:152)at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140)at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:742)at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:389)at org.springframework.boot.SpringApplication.run(SpringApplication.java:311)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1213)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1202)at cn.com.dwsoft.DwPublicApplication.main(DwPublicApplication.java:48)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.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)

原由

由于spring boot启动出现扫描jar 不存在的的异常, 并不影响使用
但是做为一个程序员有必要研究原因
根据 debug 找到
org.apache.tomcat.util.scan.StandardJarScanner.process(StandardJarScanner.java
org.apache.tomcat.util.scan.StandardJarScanner.processURLs(StandardJarScanner.java
org.apache.tomcat.util.scan.StandardJarScanner.doScanClassPath(StandardJarScanner.java
后找到代码
if ("jar".equals(url.getProtocol()) || url.getPath().endsWith(Constants.JAR_EXT)) {try (Jar jar = JarFactory.newInstance(url)) {if (isScanManifest()) {processManifest(jar, isWebapp, classPathUrlsToProcess);}callback.scan(jar, webappPath, isWebapp);}}
异常在 processManifest(jar, isWebapp, classPathUrlsToProcess); 方法中抛出
由于当前类 StandardJarScanner implements JarScanner 继承于 JarScanner
JarScanner 从接口
public interface Context{/*** 获取  StandardJarScanner*/public JarScanner getJarScanner();
}
接下来找到类 TomcatServletWebServerFactory#postProcessContext(Context context) 方法解决
由于存在tomcat jar问题后改造为
TomcatServletWebServerFactory tomcatContextCustomizers 的属性
后进行改造成功解决

参考内容 : 链接.

第一次修改

@Bean
public TomcatServletWebServerFactory tomcatFactory() {return new TomcatServletWebServerFactory() {@Overrideprotected void postProcessContext(Context context) {((StandardJarScanner) context.getJarScanner()).setScanManifest(false);}};
}

由于引入的tomcat jar包冲突,

根据:链接

二次改造如下:

Failed to scan [file:/Users/zzs/.m2/repository/com/sun/xml/bind/jaxb-impl/2.1/jaxb-api.jar] from classloader hierarchy

@Beanpublic WebServerFactoryCustomizer<TomcatServletWebServerFactory> customizer() {System.out.println("初始化配置加载webapp配置！！！！！");return (factory) -> {factory.addContextCustomizers((context) -> {((StandardJarScanner)context.getJarScanner()).setScanManifest(false);});};
}

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spring boot启动 Failed to scan from classloader hierarchy 解决方案

文章目录

错误如下 :

原由

第一次修改

二次改造如下:

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