Question

我有一个问题：

我有一个使用Weka和Jena库的Java类（使用Dynamic Web Project）。我想使用Tomcat7和Axis2将此类公开为Web服务。我通过右键单击类并选择名为＆＃34; Web Service＆＃34;的选项菜单来创建Web服务。

当我部署我的Web服务时，我收到此错误：

org.apache.axis2.deployment.DeploymentException: The following error occurred during schema generation: null
    at org.apache.axis2.deployment.ServiceBuilder.populateService(ServiceBuilder.java:432)
    at org.apache.axis2.deployment.repository.util.ArchiveReader.buildServiceGroup(ArchiveReader.java:101)
    at org.apache.axis2.deployment.repository.util.ArchiveReader.processServiceGroup(ArchiveReader.java:178)
    at org.apache.axis2.deployment.ServiceDeployer.deploy(ServiceDeployer.java:82)
    at org.apache.axis2.deployment.repository.util.DeploymentFileData.deploy(DeploymentFileData.java:136)
    at org.apache.axis2.deployment.DeploymentEngine.doDeploy(DeploymentEngine.java:813)
    at org.apache.axis2.deployment.repository.util.WSInfoList.update(WSInfoList.java:144)
    at org.apache.axis2.deployment.RepositoryListener.update(RepositoryListener.java:377)
    at org.apache.axis2.deployment.RepositoryListener.checkServices(RepositoryListener.java:254)
    at org.apache.axis2.deployment.DeploymentEngine.loadServices(DeploymentEngine.java:142)
    at org.apache.axis2.deployment.WarBasedAxisConfigurator.loadServices(WarBasedAxisConfigurator.java:283)
    at org.apache.axis2.context.ConfigurationContextFactory.createConfigurationContext(ConfigurationContextFactory.java:95)
    at org.apache.axis2.transport.http.AxisServlet.initConfigContext(AxisServlet.java:584)
    at org.apache.axis2.transport.http.AxisServlet.init(AxisServlet.java:454)
    at org.apache.axis2.webapp.AxisAdminServlet.init(AxisAdminServlet.java:60)
    at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1189)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1103)
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1010)
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4935)
    at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5262)
    at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5257)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.axis2.deployment.DeploymentException: The following error occurred during schema generation: null
    at org.apache.axis2.deployment.ServiceBuilder.populateService(ServiceBuilder.java:396)
    ... 24 more
Caused by: java.lang.NullPointerException
    at org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.generateSchema(DefaultSchemaGenerator.java:606)
    at org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.generateSchemaTypeforNameCommon(DefaultSchemaGenerator.java:1092)
    at org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.generateSchemaForType(DefaultSchemaGenerator.java:996)
    at org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.processMethods(DefaultSchemaGenerator.java:413)
    at org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.generateSchema(DefaultSchemaGenerator.java:273)
    at org.apache.axis2.deployment.util.Utils.fillAxisService(Utils.java:468)
    at org.apache.axis2.deployment.ServiceBuilder.populateService(ServiceBuilder.java:388)
    ... 24 more
[ERROR] The Prova service, which is not valid, caused The following error occurred during schema generation: null
org.apache.axis2.deployment.DeploymentException: The following error occurred during schema generation: null
    at org.apache.axis2.deployment.ServiceBuilder.populateService(ServiceBuilder.java:432)
    at org.apache.axis2.deployment.repository.util.ArchiveReader.buildServiceGroup(ArchiveReader.java:101)
    at org.apache.axis2.deployment.repository.util.ArchiveReader.processServiceGroup(ArchiveReader.java:178)
    at org.apache.axis2.deployment.ServiceDeployer.deploy(ServiceDeployer.java:82)
    at org.apache.axis2.deployment.repository.util.DeploymentFileData.deploy(DeploymentFileData.java:136)
    at org.apache.axis2.deployment.DeploymentEngine.doDeploy(DeploymentEngine.java:813)
    at org.apache.axis2.deployment.repository.util.WSInfoList.update(WSInfoList.java:144)
    at org.apache.axis2.deployment.RepositoryListener.update(RepositoryListener.java:377)
    at org.apache.axis2.deployment.RepositoryListener.checkServices(RepositoryListener.java:254)
    at org.apache.axis2.deployment.DeploymentEngine.loadServices(DeploymentEngine.java:142)
    at org.apache.axis2.deployment.WarBasedAxisConfigurator.loadServices(WarBasedAxisConfigurator.java:283)
    at org.apache.axis2.context.ConfigurationContextFactory.createConfigurationContext(ConfigurationContextFactory.java:95)
    at org.apache.axis2.transport.http.AxisServlet.initConfigContext(AxisServlet.java:584)
    at org.apache.axis2.transport.http.AxisServlet.init(AxisServlet.java:454)
    at org.apache.axis2.webapp.AxisAdminServlet.init(AxisAdminServlet.java:60)
    at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1189)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1103)
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1010)
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4935)
    at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5262)
    at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5257)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.axis2.deployment.DeploymentException: The following error occurred during schema generation: null
    at org.apache.axis2.deployment.ServiceBuilder.populateService(ServiceBuilder.java:396)
    ... 24 more
Caused by: java.lang.NullPointerException
    at org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.generateSchema(DefaultSchemaGenerator.java:606)
    at org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.generateSchemaTypeforNameCommon(DefaultSchemaGenerator.java:1092)
    at org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.generateSchemaForType(DefaultSchemaGenerator.java:996)
    at org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.processMethods(DefaultSchemaGenerator.java:413)
    at org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.generateSchema(DefaultSchemaGenerator.java:273)
    at org.apache.axis2.deployment.util.Utils.fillAxisService(Utils.java:468)
    at org.apache.axis2.deployment.ServiceBuilder.populateService(ServiceBuilder.java:388)
    ... 24 more
[INFO] org.apache.axis2.deployment.DeploymentException: The following error occurred during schema generation: null
[INFO] Deploying Web service: version.aar - file:/C:/apache-tomcat-8.0.1-src/wtpwebapps/ProvaListMap/WEB-INF/services/version.aar
[WARN] No transportReceiver for org.apache.axis2.transport.http.AxisServletListener found. An instance for HTTP will be configured automatically. Please update your axis2.xml file!

我已经看到当我添加使用Weka Libs的方法时出现此错误：

public Instances Prova(SortedMap<String,String> map) throws Exception {

        @SuppressWarnings("rawtypes")
        Iterator it = map.entrySet().iterator();
        int riga=0;
        int colonna=0;
        String[][] data = new String[map.size()][map.size()];

        while (it.hasNext()) {
            @SuppressWarnings("rawtypes")
            Map.Entry entry = (Map.Entry)it.next();
            data [riga][colonna]=entry.getKey().toString();
            data [riga][colonna+1]=entry.getValue().toString();

            riga=riga+1;
        }

        int numInstances = data[0].length;

        //ArrayList<Attribute> atts = new ArrayList<Attribute>();
        FastVector atts = new FastVector();
        List<Instance> instances = new ArrayList<Instance>();
        for(int dim = 0; dim < 2; dim++)
        {
            Attribute current = new Attribute("Attribute" + dim, (FastVector) null, dim);
            if(dim == 0)
            {
                for(int obj = 0; obj < numInstances; obj++)
                {
                    instances.add(new SparseInstance(2));
                }
            }

            for(int obj = 0; obj < numInstances; obj++)
            {
                instances.get(obj).setValue(current, data[obj][dim]);
            }
            atts.addElement(current);
        }

        Instances newDataset = new Instances("Dataset", atts, instances.size());

        for(Instance inst : instances){
            newDataset.add(inst);
        }
        return newDataset;
    }

为什么会出现此错误？在Java中，我没有这个错误。

Answer 1

我最近在使用axis2 + TomCat 7时遇到了这种错误。

我迷路了，我不知道问题来自于我是否拥有所有正确的配置。

比我能够发现问题。问题来自我在非Web服务类上使用的方法名称。

我有一个用户类来存储一些用户数据，所有属性都有各自的getter和setter。然后，该类由Web服务类使用。

这是导致异常的方法：

public class User {
    ...
    private boolean mIsYahoo;
    ...
    public void setIsYahoo(boolean isYahoo) {
        mIsYahoo = isYahoo;
    }
    ...
}

org.apache.axis2.deployment.DeploymentException：在架构生成期间发生以下错误：null

只需更改方法名称即可解决问题：

public void setYahoo(boolean isYahoo) {
    mIsYahoo = isYahoo;
}

我能够这样找到：

我从WebService中删除了所有方法并检查它已成功部署。
然后我开始逐个重新插入WebMethods 每次重新部署，直到我发现此异常是在何时引起的我插入了一个以用户对象作为参数的WebMethod。
我从User类中删除了所有方法并重新部署了包含所有WebMethods的WebService包括使用的WebService 用户对象并选中已成功部署的对象。
然后我开始逐个重新插入User方法重新部署WebService，直到我发现此异常为止由上述方法引起的。
我假设某些名称解析更改了方法的名称 conflits。它起作用了!!!

我希望这些信息可能对未来可能面临这个问题的人有所帮助，因为我花了整整一夜的时间。

使用Axis2部署Web Service时出错

1 个答案: