Java - java.lang.NullPointerException-6ren

Java - java.lang.NullPointerException

转载作者：行者123 更新时间：2023-12-02 07:07:20

我正在尝试将日志系统实现到 OSGI 包中。这是捆绑激活器:

import javax.sql.DataSource;
import java.sql.SQLException;

import java.util.Properties;
import org.DX_57.osgi.LS_27.api.LoggingSystem;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.osgi.framework.Filter;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.ServiceRegistration;
import org.osgi.util.tracker.ServiceTracker;


public class LoggingSystemApp implements BundleActivator {

    LoggingSystemImpl log = null;

    public ServiceTracker st;

    @Override
    public void start(final BundleContext bc) throws Exception {
        debug("Activator started");

        ServiceRegistration registerService = bc.registerService(LoggingSystemImpl.class.getName(), new LoggingSystemImpl() {}, new Properties());
          /* Start Logger System */
          log = LoggingSystemImpl.getInstance();
          log.start();       


    }

    public void stop(BundleContext bc) throws Exception {
        boolean ungetService = bc.ungetService(bc.getServiceReference(LoggingSystem.class.getName()));
        st.close();

        log.stop();
    }

    private void debug(String msg) {
        System.out.println("JDBCBundleActivator: " + msg);
    }

}

这是日志系统的代码:

import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;
import java.sql.Connection;
import javax.sql.DataSource;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Calendar;
import java.util.Locale;
import org.DX_57.osgi.LS_27.api.LoggingSystem;

public class LoggingSystemImpl implements LoggingSystem {

       public LoggingSystemImpl() {
       }


        private final static Calendar calendar = Calendar.getInstance();
        private final static String user = System.getenv("USERNAME").toLowerCase();
        private final static String sMonth = calendar.getDisplayName(Calendar.MONTH, Calendar.LONG, Locale.ENGLISH);
        private final static int y = calendar.get(Calendar.YEAR);

        // the name of the log file
        //private final String logName = sysDrive + "\\fttb_web - " + sMonth.toLowerCase() + ", " + y + ".log";
        private final String logName = "logger - " + sMonth.toLowerCase() + ", " + y + ".log";

        private static boolean closed;
        private static LoggingSystemImpl log = null;
        private static BufferedWriter bw = null;
        private static FileOutputStream fos = null;
        private static OutputStreamWriter osw = null;


        /* Utilialize Buffer and wait for data to write */
        public void start() throws IOException{            
            log = LoggingSystemImpl.getInstance();
        }

        public void stop(){            
            log.close();           
        }

        public void WriteLog(String WriteString){
            log.writeln(WriteString);            
        }

        public void LoggingSystemImpl() throws IOException
        {
            fos = new FileOutputStream(logName, true);

            // set encoding to cyrillic (if available)
            if (Charset.isSupported("windows-1251"))
            {
                osw = new OutputStreamWriter(fos, Charset.forName("windows-1251"));
            }
            else { osw = new OutputStreamWriter(fos); }

            bw = new BufferedWriter(osw, 2048); // 2Mb buffer


        }

        // intro header for log session
        public static synchronized LoggingSystemImpl getInstance() throws IOException
        {
            boolean exc = false;
            try
            {
                if (log == null || closed)
                {
                    log = new LoggingSystemImpl() {};
                    closed = false;
                    log.writeln("logged in.");
                    log.nl();
                }
            }
    //      catch(IOException x) { exc = true; throw x; }
            catch(Exception x) { exc = true; x.printStackTrace(); }
            finally
            {
                if (exc)
                {
                    try
                    {
                        if (fos != null) { fos.close(); fos = null; }
                        if (osw != null) { osw.close(); fos = null; }
                        if (bw != null)  { bw.close(); bw = null; }
                    }
                    catch(Exception x) { x.printStackTrace(); }
                }
            }
            return log;
        }


        public synchronized void nl()
        {
            try { bw.newLine(); }
            catch(IOException x) {x.printStackTrace();}
        }

        public synchronized void nl(int count)
        {
            try
            {
                for (int i = 0; i < count; i++) bw.newLine();
            }
            catch(IOException x) {x.printStackTrace();}
        }
        public synchronized void writeln(String s)
        {
            try { bw.write(getTime() + ": " + s); bw.newLine(); }
            catch(IOException x) {x.printStackTrace();}
        }

        public synchronized void write(String s)
        {
            try { bw.write(s); }
            catch (IOException x) {x.printStackTrace();}
        }

        public synchronized void close()
        {
            try
            {
                if (bw != null)
                {
                    writeln("logged out.");
                    nl();
                    bw.flush();
                    bw.close();
                    closed = true;

                    fos = null;
                    osw = null;
                    bw = null;
                }
            }
            catch(IOException x) { x.printStackTrace(); }

        }

        public synchronized boolean isClosed() { return closed; }

        public synchronized void writeException(Exception x)
        {
            writeln("");
            write("\t" + x.toString()); nl();
            StackTraceElement[] ste = x.getStackTrace();
            int j = 0;
            for (int i = 0; i < ste.length; i++)
            {

                if (i < 15) { write("\t\tat " + ste[i].toString()); nl(); }
                else { j++; }

            }

            if (j > 0) { write("\t\t... " + j + " more"); nl(); }

            nl(2);
        }

        private String getTime()
        {
            Calendar c = Calendar.getInstance();
            int month = c.get(Calendar.MONTH) + 1;

            int d = c.get(Calendar.DAY_OF_MONTH);
            int h = c.get(Calendar.HOUR_OF_DAY);

            int m = c.get(Calendar.MINUTE);
            int s = c.get(Calendar.SECOND);
            int y = c.get(Calendar.YEAR);

            String dd = d < 10 ? "0"+d : ""+d;
            String hh = h < 10 ? "0"+h : ""+h;
            String mm = m < 10 ? "0"+m : ""+m;
            String ss = s < 10 ? "0"+s : ""+s;
            String sm = month < 10 ? "0"+month : ""+month;

            return user + " [" + y + "." + sm + "." + dd + " " + hh +  ":" + mm +  ":" + ss + "]";
        }



}

这是 Java 接口(interface):

public interface LoggingSystem {



}

当我尝试在 Glassfish 服务器上部署代码时，我得到了这个错误堆栈:

[#|2012-03-14T13:20:42.940+0200|INFO|glassfish3.1.2|org.hibernate.validator.util.Version|_ThreadID=50;_ThreadName=Thread-2;|Hibernate Validator 4.2.0.Final|#]

[#|2012-03-14T13:20:44.147+0200|INFO|glassfish3.1.2|javax.enterprise.system.container.web.com.sun.enterprise.web|_ThreadID=50;_ThreadName=Thread-2;|WEB0671: Loading application [__admingui] at [/]|#]

[#|2012-03-14T13:20:44.150+0200|INFO|glassfish3.1.2|javax.enterprise.system.core.com.sun.enterprise.v3.server|_ThreadID=50;_ThreadName=Thread-2;|CORE10010: Loading application __admingui done in 12,777 ms|#]

[#|2012-03-14T13:20:44.150+0200|INFO|glassfish3.1.2|javax.enterprise.system.core.com.sun.enterprise.v3.admin.adapter|_ThreadID=50;_ThreadName=Thread-2;|The Admin Console application is loaded.|#]

[#|2012-03-14T13:20:54.222+0200|INFO|glassfish3.1.2|javax.enterprise.system.tools.admin.com.sun.enterprise.container.common|_ThreadID=66;_ThreadName=Thread-2;|User [] from host localhost does not have administration access|#]

[#|2012-03-14T13:21:10.569+0200|INFO|glassfish3.1.2|javax.enterprise.system.container.ejb.com.sun.ejb.containers|_ThreadID=75;_ThreadName=Thread-2;|Created EjbThreadPoolExecutor with thread-core-pool-size 16 thread-max-pool-size 32 thread-keep-alive-seconds 60 thread-queue-capacity 2147483647 allow-core-thread-timeout false |#]

[#|2012-03-14T13:21:12.530+0200|INFO|glassfish3.1.2|com.sun.jersey.server.impl.application.WebApplicationImpl|_ThreadID=75;_ThreadName=Thread-2;|Initiating Jersey application, version 'Jersey: 1.11 12/09/2011 10:27 AM'|#]

[#|2012-03-14T13:21:13.546+0200|INFO|glassfish3.1.2|javax.enterprise.system.tools.admin.org.glassfish.admin.rest.adapter|_ThreadID=75;_ThreadName=Thread-2;|REST00001: Listening to REST requests at context: /management/domain|#]

[#|2012-03-14T13:21:13.587+0200|INFO|glassfish3.1.2|org.glassfish.admingui|_ThreadID=74;_ThreadName=Thread-2;|Redirecting to /common/index.jsf|#]

[#|2012-03-14T13:21:14.133+0200|INFO|glassfish3.1.2|org.glassfish.admingui|_ThreadID=72;_ThreadName=Thread-2;|Admin Console: Initializing Session Attributes...|#]

[#|2012-03-14T13:22:04.476+0200|INFO|glassfish3.1.2|javax.enterprise.system.std.com.sun.enterprise.server.logging|_ThreadID=74;_ThreadName=Thread-2;|Stopped LS_27-api [470]|#]

[#|2012-03-14T13:22:04.489+0200|INFO|glassfish3.1.2|javax.enterprise.system.std.com.sun.enterprise.server.logging|_ThreadID=74;_ThreadName=Thread-2;|Uninstalled LS_27-api [470]|#]

[#|2012-03-14T13:22:04.878+0200|INFO|glassfish3.1.2|javax.enterprise.system.std.com.sun.enterprise.server.logging|_ThreadID=137;_ThreadName=Thread-2;|com.sun.webui.jsf.component.DropDown::The current value of component propertyForm:deployTable:topActionsGroup1:filter does not match any of the selections. 
Did you forget to reset the value after changing the options? |#]

[#|2012-03-14T13:22:19.830+0200|WARNING|glassfish3.1.2|org.apache.catalina.connector.Request|_ThreadID=135;_ThreadName=Thread-2;|PWC4011: Unable to set request character encoding to UTF-8 from context , because request parameters have already been read, or ServletRequest.getReader() has already been called|#]

[#|2012-03-14T13:22:19.968+0200|INFO|glassfish3.1.2|org.glassfish.admingui|_ThreadID=135;_ThreadName=Thread-2;|GUI deployment: uploadToTempfile|#]

[#|2012-03-14T13:22:19.995+0200|INFO|glassfish3.1.2|org.glassfish.admingui|_ThreadID=135;_ThreadName=Thread-2;|uploadFileName=LS_27-api-1.0-SNAPSHOT.jar|#]

[#|2012-03-14T13:22:20.081+0200|INFO|glassfish3.1.2|javax.enterprise.system.std.com.sun.enterprise.server.logging|_ThreadID=302;_ThreadName=Thread-2;|Installed LS_27-api [472] from reference:file:/opt/glassfish3/glassfish/domains/domain1/applications/LS_27-api-1.0-SNAPSHOT/|#]

[#|2012-03-14T13:22:20.090+0200|INFO|glassfish3.1.2|javax.enterprise.system.std.com.sun.enterprise.server.logging|_ThreadID=302;_ThreadName=Thread-2;|Started LS_27-api [472]|#]

[#|2012-03-14T13:22:20.128+0200|INFO|glassfish3.1.2|javax.enterprise.system.tools.admin.org.glassfish.deployment.admin|_ThreadID=302;_ThreadName=Thread-2;|LS_27-api-1.0-SNAPSHOT was successfully deployed in 115 milliseconds.|#]

[#|2012-03-14T13:22:33.840+0200|WARNING|glassfish3.1.2|org.apache.catalina.connector.Request|_ThreadID=313;_ThreadName=Thread-2;|PWC4011: Unable to set request character encoding to UTF-8 from context , because request parameters have already been read, or ServletRequest.getReader() has already been called|#]

[#|2012-03-14T13:22:33.962+0200|INFO|glassfish3.1.2|org.glassfish.admingui|_ThreadID=313;_ThreadName=Thread-2;|GUI deployment: uploadToTempfile|#]

[#|2012-03-14T13:22:33.963+0200|INFO|glassfish3.1.2|org.glassfish.admingui|_ThreadID=313;_ThreadName=Thread-2;|uploadFileName=LS_27-impl-1.0-SNAPSHOT.jar|#]

[#|2012-03-14T13:22:34.043+0200|INFO|glassfish3.1.2|javax.enterprise.system.std.com.sun.enterprise.server.logging|_ThreadID=311;_ThreadName=Thread-2;|Installed LS_27-impl [473] from reference:file:/opt/glassfish3/glassfish/domains/domain1/applications/LS_27-impl-1.0-SNAPSHOT/|#]

[#|2012-03-14T13:22:34.046+0200|INFO|glassfish3.1.2|javax.enterprise.system.std.com.sun.enterprise.server.logging|_ThreadID=311;_ThreadName=Thread-2;|JDBCBundleActivator: Activator started|#]

[#|2012-03-14T13:22:34.050+0200|SEVERE|glassfish3.1.2|javax.enterprise.system.tools.admin.org.glassfish.deployment.admin|_ThreadID=311;_ThreadName=Thread-2;|Exception while invoking class org.glassfish.extras.osgicontainer.OSGiDeployedBundle start method
java.lang.RuntimeException: org.osgi.framework.BundleException: Activator start error in bundle LS_27-impl [473].
    at org.glassfish.extras.osgicontainer.OSGiDeployedBundle.startBundle(OSGiDeployedBundle.java:110)
    at org.glassfish.extras.osgicontainer.OSGiDeployedBundle.resume(OSGiDeployedBundle.java:83)
    at org.glassfish.extras.osgicontainer.OSGiDeployedBundle.start(OSGiDeployedBundle.java:67)
    at org.glassfish.internal.data.EngineRef.start(EngineRef.java:130)
    at org.glassfish.internal.data.ModuleInfo.start(ModuleInfo.java:269)
    at org.glassfish.internal.data.ApplicationInfo.start(ApplicationInfo.java:301)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:461)
    at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:391)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:348)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:363)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1085)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1200(CommandRunnerImpl.java:95)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1291)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1259)
    at org.glassfish.admin.rest.ResourceUtil.runCommand(ResourceUtil.java:214)
    at org.glassfish.admin.rest.ResourceUtil.runCommand(ResourceUtil.java:207)
    at org.glassfish.admin.rest.resources.TemplateListOfResource.createResource(TemplateListOfResource.java:148)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
    at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)
    at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
    at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
    at com.sun.jersey.server.impl.uri.rules.SubLocatorRule.accept(SubLocatorRule.java:134)
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
    at com.sun.jersey.server.impl.uri.rules.SubLocatorRule.accept(SubLocatorRule.java:134)
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
    at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
    at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1469)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1400)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339)
    at com.sun.jersey.server.impl.container.grizzly.GrizzlyContainer._service(GrizzlyContainer.java:182)
    at com.sun.jersey.server.impl.container.grizzly.GrizzlyContainer.service(GrizzlyContainer.java:147)
    at org.glassfish.admin.rest.adapter.RestAdapter.service(RestAdapter.java:148)
    at com.sun.grizzly.tcp.http11.GrizzlyAdapter.service(GrizzlyAdapter.java:179)
    at com.sun.enterprise.v3.server.HK2Dispatcher.dispath(HK2Dispatcher.java:117)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$Hk2DispatcherCallable.call(ContainerMapper.java:354)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:722)
Caused by: org.osgi.framework.BundleException: Activator start error in bundle LS_27-impl [473].
    at org.apache.felix.framework.Felix.activateBundle(Felix.java:2027)
    at org.apache.felix.framework.Felix.startBundle(Felix.java:1895)
    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:944)
    at org.glassfish.extras.osgicontainer.OSGiDeployedBundle.startBundle(OSGiDeployedBundle.java:107)
    ... 56 more
Caused by: java.lang.ExceptionInInitializerError
    at org.DX_57.osgi.LS_27.impl.LoggingSystemApp.start(LoggingSystemApp.java:38)
    at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:641)
    at org.apache.felix.framework.Felix.activateBundle(Felix.java:1977)
    ... 59 more
Caused by: java.lang.NullPointerException
    at org.DX_57.osgi.LS_27.impl.LoggingSystemImpl.<clinit>(LoggingSystemImpl.java:41)
    ... 62 more
|#]

[#|2012-03-14T13:22:34.072+0200|SEVERE|glassfish3.1.2|javax.enterprise.system.core.com.sun.enterprise.v3.server|_ThreadID=311;_ThreadName=Thread-2;|Exception while loading the app|#]

[#|2012-03-14T13:22:34.077+0200|INFO|glassfish3.1.2|javax.enterprise.system.std.com.sun.enterprise.server.logging|_ThreadID=311;_ThreadName=Thread-2;|Uninstalled LS_27-impl [473]|#]

[#|2012-03-14T13:22:34.080+0200|SEVERE|glassfish3.1.2|javax.enterprise.system.tools.admin.org.glassfish.deployment.admin|_ThreadID=311;_ThreadName=Thread-2;|Exception while loading the app : org.osgi.framework.BundleException: Activator start error in bundle LS_27-impl [473].
org.osgi.framework.BundleException: Activator start error in bundle LS_27-impl [473].
    at org.apache.felix.framework.Felix.activateBundle(Felix.java:2027)
    at org.apache.felix.framework.Felix.startBundle(Felix.java:1895)
    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:944)
    at org.glassfish.extras.osgicontainer.OSGiDeployedBundle.startBundle(OSGiDeployedBundle.java:107)
    at org.glassfish.extras.osgicontainer.OSGiDeployedBundle.resume(OSGiDeployedBundle.java:83)
    at org.glassfish.extras.osgicontainer.OSGiDeployedBundle.start(OSGiDeployedBundle.java:67)
    at org.glassfish.internal.data.EngineRef.start(EngineRef.java:130)
    at org.glassfish.internal.data.ModuleInfo.start(ModuleInfo.java:269)
    at org.glassfish.internal.data.ApplicationInfo.start(ApplicationInfo.java:301)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:461)
    at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:391)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:348)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:363)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1085)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1200(CommandRunnerImpl.java:95)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1291)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1259)
    at org.glassfish.admin.rest.ResourceUtil.runCommand(ResourceUtil.java:214)
    at org.glassfish.admin.rest.ResourceUtil.runCommand(ResourceUtil.java:207)
    at org.glassfish.admin.rest.resources.TemplateListOfResource.createResource(TemplateListOfResource.java:148)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
    at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)
    at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
    at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
    at com.sun.jersey.server.impl.uri.rules.SubLocatorRule.accept(SubLocatorRule.java:134)
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
    at com.sun.jersey.server.impl.uri.rules.SubLocatorRule.accept(SubLocatorRule.java:134)
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
    at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
    at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1469)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1400)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339)
    at com.sun.jersey.server.impl.container.grizzly.GrizzlyContainer._service(GrizzlyContainer.java:182)
    at com.sun.jersey.server.impl.container.grizzly.GrizzlyContainer.service(GrizzlyContainer.java:147)
    at org.glassfish.admin.rest.adapter.RestAdapter.service(RestAdapter.java:148)
    at com.sun.grizzly.tcp.http11.GrizzlyAdapter.service(GrizzlyAdapter.java:179)
    at com.sun.enterprise.v3.server.HK2Dispatcher.dispath(HK2Dispatcher.java:117)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$Hk2DispatcherCallable.call(ContainerMapper.java:354)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.ExceptionInInitializerError
    at org.DX_57.osgi.LS_27.impl.LoggingSystemApp.start(LoggingSystemApp.java:38)
    at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:641)
    at org.apache.felix.framework.Felix.activateBundle(Felix.java:1977)
    ... 59 more
Caused by: java.lang.NullPointerException
    at org.DX_57.osgi.LS_27.impl.LoggingSystemImpl.<clinit>(LoggingSystemImpl.java:41)
    ... 62 more
|#]

[#|2012-03-14T13:22:34.084+0200|INFO|glassfish3.1.2|org.glassfish.admingui|_ThreadID=313;_ThreadName=Thread-2;|Exception Occurred :Error occurred during deployment: Exception while loading the app : org.osgi.framework.BundleException: Activator start error in bundle LS_27-impl [473].. Please see server.log for more details.|#]

我在捆绑激活器中有一个错误，我找不到。我想实现将错误消息写入文本文件的日志记录包。部署 bundle 时， bundle 必须打开文本文件并监听来自其他 OSGI bundle 的消息，它必须将这些消息记录到文件中。

最良好的祝愿彼得

最佳答案

似乎异常是在类初始化时抛出的(正如堆栈跟踪 at ... LoggingSystemImpl.<clinit> 所指出的)。这通常在类静态字段初始化阶段出现错误时抛出。

检查您的 LoggingSystemImpl类代码，在字段声明中找到:

private final static String user = System.getenv("USERNAME").toLowerCase();

如果系统找不到这个环境值，它会返回null ( reference ), 因此, toLowerCase对空引用的调用将抛出 NullPointerException .

你有没有检查环境属性 "USERNAME"在运行时可用吗？

关于Java - java.lang.NullPointerException，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/9701124/

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Java - java.lang.NullPointerException