How can I fix an UnsupportedClassVersionError?

Question

Exception in thread "main" java.lang.UnsupportedClassVersionError:
/DataManager has been compiled by a more recent version of the Java 
Runtime (class file version 56.0), this version of the Java Runtime
recognizes class file versions up to 52.0

Here's the stack trace:

Stacktrace:] with root cause
java.lang.UnsupportedClassVersionError: com/north/webapp/DataManager has been compiled by a more recent version of the Java Runtime (class file version 56.0), this version of the Java Runtime only recognizes class file versions up to 52.0 (unable to load class [com.north.webapp.DataManager])
    at org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2424)
    at org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:865)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1334)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1188)
    at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:122)
    at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:59)
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:130)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

i have changed my jdk from version 9 to 8 because of an error that I was getting when i tried to compile

do you have a stack trace? what is written below those lines in your editor? — Lena Bru, Jan 22 '20 at 23:09

score 0 · Accepted Answer · answered Jan 22 '20 at 23:14

0

class files with version 56 runs on java12 or higher. You are using java 1.8.

If the source file that produced this class file is within your control, you can try recompiling it with your java. Otherwise, you must upgrade to at least java12 to run this.

answered Jan 22 '20 at 23:14

rzwitserloot

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Yeah i made this, how can i recompile with Java 8? – David Thomas Jan 23 '20 at 17:19
javac *.java, really. Somehow your javac is pointing at a different thing than 'java'. That's bizarre, fix your path - how to do that depends on a billion factors. – rzwitserloot Jan 23 '20 at 18:09

How can I fix an UnsupportedClassVersionError?

1 Answers1