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java.lang.NullPointerException: null	at java.nio.charset.Charset.put(Charset.java:538)	at java.nio.charset.Charset.access$200(Charset.java:271)	at java.nio.charset.Charset$3.run(Charset.java:584)	at java.nio.charset.Charset$3.run(Charset.java:573)	at java.security.AccessController.doPrivileged(Native Method)	at java.nio.charset.Charset.availableCharsets(Charset.java:572)	at org.apache.tomcat.util.buf.B2CConverter.(B2CConverter.java:49)	at org.apache.tomcat.util.buf.UDecoder.URLDecode(UDecoder.java:352)	at org.apache.tomcat.util.buf.UDecoder.URLDecode(UDecoder.java:324)	at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3113)	at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.addServletMapping(TomcatEmbeddedServletContainerFactory.java:277)	at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.addDefaultServlet(TomcatEmbeddedServletContainerFactory.java:257)	at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.prepareContext(TomcatEmbeddedServletContainerFactory.java:213)	at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.getEmbeddedServletContainer(TomcatEmbeddedServletContainerFactory.java:176)	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:164)	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:134)	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:535)	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761)	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371)	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186)	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175)	at main.java.appstarter.SpringBootPractice.main(SpringBootPractice.java:19)