Getting "Invlalid minute value = ?" from java @Schedule annotation

Got an issue today when trying to use a Java @Schedule annotation on one of my methods. Error is as follows:

Severe:   Exception while deploying the app [MyApp-ear] : Error processing EjbDescriptor
java.lang.RuntimeException: ScheduleManager: Invalid schedule defined on method sendEmail(): Invalid minute value: ?
at org.glassfish.ejb.deployment.util.EjbBundleValidator.accept(EjbBundleValidator.java:351)
at org.glassfish.ejb.deployment.descriptor.EjbDescriptor.visit(EjbDescriptor.java:2855)
at org.glassfish.ejb.deployment.descriptor.EjbDescriptor.visit(EjbDescriptor.java:2843)
at org.glassfish.ejb.deployment.util.EjbBundleValidator.accept(EjbBundleValidator.java:115)
at com.sun.enterprise.deployment.BundleDescriptor.visit(BundleDescriptor.java:627)
at org.glassfish.ejb.deployment.descriptor.EjbBundleDescriptorImpl.visit(EjbBundleDescriptorImpl.java:767)
at com.sun.enterprise.deployment.util.ApplicationValidator.accept(ApplicationValidator.java:121)
at com.sun.enterprise.deployment.BundleDescriptor.visit(BundleDescriptor.java:627)
at com.sun.enterprise.deployment.archivist.ApplicationArchivist.validate(ApplicationArchivist.java:703)
at com.sun.enterprise.deployment.archivist.ApplicationArchivist.openWith(ApplicationArchivist.java:248)
at com.sun.enterprise.deployment.archivist.ApplicationFactory.openWith(ApplicationFactory.java:232)
at org.glassfish.javaee.core.deployment.DolProvider.processDOL(DolProvider.java:189)
at org.glassfish.javaee.core.deployment.DolProvider.load(DolProvider.java:223)
at org.glassfish.javaee.core.deployment.DolProvider.load(DolProvider.java:91)
at com.sun.enterprise.v3.server.ApplicationLifecycle.loadDeployer(ApplicationLifecycle.java:882)
at com.sun.enterprise.v3.server.ApplicationLifecycle.setupContainerInfos(ApplicationLifecycle.java:822)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:378)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:220)
at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:487)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:539)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:535)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:360)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$2.execute(CommandRunnerImpl.java:534)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$3.run(CommandRunnerImpl.java:565)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$3.run(CommandRunnerImpl.java:557)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:360)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:556)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1464)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1300(CommandRunnerImpl.java:109)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1846)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1722)
at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:534)
at com.sun.enterprise.v3.admin.AdminAdapter.onMissingResource(AdminAdapter.java:224)
at org.glassfish.grizzly.http.server.StaticHttpHandlerBase.service(StaticHttpHandlerBase.java:189)
at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:466)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:169)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:539)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:593)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:573)
at java.lang.Thread.run(Thread.java:748)

My method declaration looks like this:

@Schedule(minute = "∗/5")
public void sendEmail() {
  //Send email here
}

Any idea what could be causing this? I’ve used this many a time and never had any problems but mostly used the “dayOfMonth” attribute. I found the expression that I was looking for on the Oracle Docs for @Schedule to run every 5 minutes on the hour.

The * char was invalid, but you already noticed that 🙂

Important hint: your scheduling is still wrong!

When not specifying any of the annotation’s parameters, it will fall back to the default value. The default value for hour is 0, meaning that your scheduled task will run every 5 minutes from 00:05 to 00:55, and then be idle for the next 23 hours.

To fix this, also specify the hours as *:

@Schedule(hour = "*", minute = "*/5")

See default values in Schedule:

public @interface Schedule {

    String second() default "0";
    String minute() default "0";
    String hour() default "0";

Turns out it was a silly copy-paste issue from the Oracle Docs website. It copied a ‘∗’ instead of a ‘*’ which caused the JVM to crash at runtime. Do not copy from the Oracle Docs website, lesson learned.

Well I hope this saves someone 30 minutes in the future should they run into the same problem.

Regards,