Java Errors

When I try to run application jar using the command line on macOS, I get this error " no main manifest attribute, in ...." I try these solutions, but no one of them seems to work : You should have been used this  java -jar app.jar instead of this  java -jar "app" java - cp your . jar Mainclass. Export you Java Project as an  Runnable Jar file  rather than Jar. A manifest is a file in the path META-INF/MANIFEST.MF within the jar which defines attributes like the classpath and the main class for running the jar file.  had the same problem. Make sure your MANIFEST.MF is in: src / main / resources / META_INF / NOT src / main / java / META_INF / the only thing that works for me by using maven as follow: <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-jar-plugin</artifactId> <configuration> <version>3.0.2</...

Error: signed modular JAR...mail-1.4.7.jar is currently not supported, use --ignore-signing-information to suppress error

Caused By:javax.servlet.ServletException: org.apache.commons.fileupload.FileUploadBase$IOFileUploadException: Processing of multipart/form-data request failed. Read timed out javax.servlet.ServletException: org.apache.commons.fileupload.FileUploadBase$IOFileUploadException: Processing of multipart/form-data request failed. Read timed out at org.apache.struts.upload.CommonsMultipartRequestHandler.handleRequest(CommonsMultipartRequestHandler.java:202) at cn.edu.sdu.framework.bs.SysRequestProcessor.process(SysRequestProcessor.java:445) at org.apache.struts.util.RequestUtils.populate(RequestUtils.java:443) at org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:805) at cn.edu.sdu.framework.bs.UimsActionServlet.doPost(UimsActionServlet.java:597) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194) at cn.edu.sdu.framework.bs.UimsActionServlet.doGet(UimsActionServlet.java:620) at javax.servlet.http.HttpServlet.service(HttpSe...

Warning: java executable not found in JDK, evaluating java executable in RT instead. Warning: java executable not found in JDK, evaluating java executable in RT instead. Warning: java executable not found in JDK, evaluating java executable in RT instead.

from this int a ; if ( i != 0 && k == 7 ){ a = 10 ; } else a = 3 ; } to this nice one int a = ( i != 0 && k == 7 ) ? 10 : 3 ;

An error has occurred. See error log for more details. org.eclipse.jst.javaee.applicationclient.internal.impl.ApplicationClientImpl cannot be cast to org.eclipse.jst.javaee.web.WebApp

Error Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/core/OrderComparator$OrderSourceProvider at springuate.main.main(main.java:22) Caused by: java.lang.ClassNotFoundException: org.springframework.core.OrderComparator$OrderSourceProvider at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 1 more D:\....\NetBeans\Cache\8.1\executor-snippets\run.xml:53: Java returned: 1 BUILD FAILED (total time: 0 seconds)  Solution You need just to add the latest JAR spring-core-4.3.3.RELEASE spring-beans-4.3.3.RELEASE commons-logging-1.2