Constructor.newInstance(): java.lang.IllegalArgumentException: argument type mismatch

Question

I have the following class:

public class DefaultContainer extends AbstractContainer {

private JobBeanFactory jobBeanFactory;

private ScheduleManager scheduleManager;

/**
 * for local
 * @param classLoader
 * @param packagesToScan
 */
public DefaultContainer(ClassLoader classLoader, String packagesToScan) {
    super(classLoader, packagesToScan);
    this.jobBeanFactory = new DefaultJobBeanFactory();
    Configuration configuration = new Configuration(classLoader);
    this.scheduleManager = new DefaultScheduleManager(configuration, this.jobBeanFactory, getJobScanner().getJobDescriptorList());
}

/**
 * for remote
 * @param configuration
 * @param packagesToScan
 * @param jarUrls
 */
public DefaultContainer(Configuration configuration, String packagesToScan, String... jarUrls) {
    super(packagesToScan, jarUrls);
    this.jobBeanFactory = new DefaultJobBeanFactory();
    this.scheduleManager = new DefaultScheduleManager(configuration, this.jobBeanFactory, getJobScanner().getJobDescriptorList());
}


public ScheduleManager scheduleManager() {
    return scheduleManager;
}

}

Then, I use reflection to load and create a class instance.

Class<Container> containerClass = (Class<Container>) classLoader.loadClass("xxxxx.DefaultContainer");
Constructor<Container> containerConstructor = containerClass.getConstructor(Configuration.class, String.class, String[].class);
container = containerConstructor.newInstance(getConfiguration(), packagesToScan, new String[]{jarUrl});

But when executing a method of newInstance, then I get an exception:

com.zuoxiaolong.niubi.job.core.exception.NiubiException: java.lang.IllegalArgumentException: argument type mismatch
at com.zuoxiaolong.niubi.job.cluster.node.AbstractRemoteJobNode.createContainer(AbstractRemoteJobNode.java:100)
at com.zuoxiaolong.niubi.job.cluster.node.AbstractRemoteJobNode.getContainer(AbstractRemoteJobNode.java:67)
at com.zuoxiaolong.niubi.job.cluster.node.MasterSlaveNode.executeOperation(MasterSlaveNode.java:264)
at com.zuoxiaolong.niubi.job.cluster.node.MasterSlaveNode.access$1000(MasterSlaveNode.java:56)
at com.zuoxiaolong.niubi.job.cluster.node.MasterSlaveNode$3.childEvent(MasterSlaveNode.java:253)
at org.apache.curator.framework.recipes.cache.PathChildrenCache$5.apply(PathChildrenCache.java:516)
at org.apache.curator.framework.recipes.cache.PathChildrenCache$5.apply(PathChildrenCache.java:510)
at org.apache.curator.framework.listen.ListenerContainer$1.run(ListenerContainer.java:92)
at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:297)
at org.apache.curator.framework.listen.ListenerContainer.forEach(ListenerContainer.java:83)
at org.apache.curator.framework.recipes.cache.PathChildrenCache.callListeners(PathChildrenCache.java:507)
at org.apache.curator.framework.recipes.cache.EventOperation.invoke(EventOperation.java:35)
at org.apache.curator.framework.recipes.cache.PathChildrenCache$9.run(PathChildrenCache.java:759)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

Caused by: java.lang.IllegalArgumentException: argument type mismatch
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
    at com.zuoxiaolong.niubi.job.cluster.node.AbstractRemoteJobNode.createContainer(AbstractRemoteJobNode.java:98)
    ... 19 more

Can anyone help me?

I make sure the parameter types are all matched with [Configuration.class,String.class,String[].class] — Xiaolong Zuo
– Xiaolong Zuo, Commented Jan 20, 2016 at 9:42
Are you sure getConfiguration() returns the same Configuration class as the constructor's parameter? Have you checked packagesToScan is indeed a String? — Mena
– Mena, Commented Jan 20, 2016 at 9:46
Also you are explicitly casting your class as Class<Container>. If Container is a class, does it have a matching constructor? — Mena
– Mena, Commented Jan 20, 2016 at 9:50
Yes, I sure. I has debug the program , and look at the program's runtime detail.It does match. — Xiaolong Zuo
– Xiaolong Zuo, Commented Jan 20, 2016 at 10:11
I eval the expressions ,then all return true. etc. Configuration.class==getConfiguration().getClass,packagesToScan.getClass()==String.class. — Xiaolong Zuo
– Xiaolong Zuo, Commented Jan 20, 2016 at 10:30

Community · Accepted Answer · 2017-05-23 12:23:56Z

1

Try to cast your String array to Object. It should help.

containerConstructor.newInstance(getConfiguration(), packagesToScan, (Object) new String[]{ jarUrl });

Here someone had the same problem:

edited May 23, 2017 at 12:23

CommunityBot

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answered Jan 20, 2016 at 18:51

Mateusz Korwel

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