小编Cha*_*had的帖子

为什么我的System.nanoTime()坏了？

我和我这个时代的另一位开发人员最近从一台Core 2 Duo机器搬到了新的Core 2 Quad 9505; 两者都使用JDK 1.6.0_18运行Windows XP SP3 32位.

在这样做的时候,我们对一些时序/统计/度量聚合代码的自动单元测试很快就会失败,因为看起来似乎是从System.nanoTime()返回的荒谬值.

在我的机器上可靠地显示此行为的测试代码是:

import static org.junit.Assert.assertThat;

import org.hamcrest.Matchers;
import org.junit.Test;

public class NanoTest {

  @Test
  public void testNanoTime() throws InterruptedException {
    final long sleepMillis = 5000;

    long nanosBefore = System.nanoTime();
    long millisBefore = System.currentTimeMillis();

    Thread.sleep(sleepMillis);

    long nanosTaken = System.nanoTime() - nanosBefore;
    long millisTaken = System.currentTimeMillis() - millisBefore;

    System.out.println("nanosTaken="+nanosTaken);
    System.out.println("millisTaken="+millisTaken);

    // Check it slept within 10% of requested time
    assertThat((double)millisTaken, Matchers.closeTo(sleepMillis, sleepMillis * 0.1));
    assertThat((double)nanosTaken, Matchers.closeTo(sleepMillis * 1000000, sleepMillis * 1000000 …

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java timestamp nanotime

Cha*_*had

2017 05-23

11
推荐指数

1
解决办法

5900
查看次数

如何阻止Maven 2.x尝试在每次构建时检索不存在的pom.xml文件以获取依赖项？

在我的项目中,有许多依赖项可传递地包含在其他依赖项中,这些依赖项没有任何公司存储库中提供的pom.xml文件.这些是由各个团队支持的内部jar专用库,为了方便起见,这些库已经上传到存储库中,但不幸的是,这些存储库不是我可以使用的.

对于这些依赖项,Maven坚持每次运行构建时都尝试从每个存储库列表中检索poms,或者mvn dependency:list.这意味着maven尝试从7个不同的存储库位置检索8x pom文件,并且这是通过全球企业WAN进行的; 它真的很慢.

例如,对于一个特定的依赖

C:\Working\dev\workspace\project>mvn dependency:list
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'dependency'.
[INFO] ------------------------------------------------------------------------
[INFO] Building project
[INFO]    task-segment: [dependency:list]
[INFO] ------------------------------------------------------------------------
[WARNING] Unable to get resource 'aGroupId:anArtifactId:pom:4.0.14i' from repository inhouse (http://someRepo1/proximity/repository/inhouse): While configuring wagon for 'inhouse': Unable to apply wagon configuration.
Downloading: http://someRepo1/proximity/repository/extFree/aGroupId/anArtifactId/4.0.14i/anArtifactId-4.0.14i.pom
[INFO] Unable to find resource 'aGroupId:anArtifactId:pom:4.0.14i' in repository extFree (http://someRepo1/proximity/repository/extFree)
Downloading: http://someRepo1/proximity/repository/externalNonFree/aGroupId/anArtifactId/4.0.14i/anArtifactId-4.0.14i.pom
[INFO] Unable to find resource 'aGroupId:anArtifactId:pom:4.0.14i' in repository extNonFree (http://someRepo1/proximity/repository/externalNonFree)
Downloading: http://someRepo2/efs/dist/maven/maven2-repository/incr/common/lib/aGroupId/anArtifactId/4.0.14i/anArtifactId-4.0.14i.pom
[INFO] Unable …

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dependencies maven-2 artifacts repository

Cha*_*had

2010 01-26

10
推荐指数

1
解决办法

9058
查看次数

"前缀xsd未绑定到命名空间"在迁移到Java 8后使用JAXB解组SOAPFault

我们有一个JAX-WS/JAXB绑定到外部Web服务,该服务在Java 7(1.7.0u80)上运行良好,包含了参考实现.在迁移到Java 8(1.8.0u66)期间,Web服务调用通常可以正常工作,但是它不能再将SOAP错误及其详细信息元素解析为具有自定义详细信息的Java异常,而是提供未绑定到命名空间错误的前缀.

失败的是

Caused by: javax.xml.ws.WebServiceException: java.lang.IllegalArgumentException: prefix xsd is not bound to a namespace
at com.sun.xml.internal.ws.fault.SOAPFaultBuilder.createException(SOAPFaultBuilder.java:138)
at com.sun.xml.internal.ws.client.sei.StubHandler.readResponse(StubHandler.java:238)
at com.sun.xml.internal.ws.db.DatabindingImpl.deserializeResponse(DatabindingImpl.java:189)
at com.sun.xml.internal.ws.db.DatabindingImpl.deserializeResponse(DatabindingImpl.java:276)
at com.sun.xml.internal.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:104)
at com.sun.xml.internal.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:77)
at com.sun.xml.internal.ws.client.sei.SEIStub.invoke(SEIStub.java:147)
at com.sun.proxy.$Proxy61.proprietaryServiceCall(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at org.springframework.remoting.jaxws.JaxWsPortClientInterceptor.doInvoke(JaxWsPortClientInterceptor.java:580)
at org.springframework.remoting.jaxws.JaxWsPortClientInterceptor.doInvoke(JaxWsPortClientInterceptor.java:554)
... 56 more
Caused by: java.lang.IllegalArgumentException: prefix xsd is not bound to a namespace
at com.sun.xml.internal.bind.DatatypeConverterImpl._parseQName(DatatypeConverterImpl.java:355)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.LeafPropertyXsiLoader.selectLoader(LeafPropertyXsiLoader.java:75)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.LeafPropertyXsiLoader.startElement(LeafPropertyXsiLoader.java:58)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:559)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:538)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.InterningXmlVisitor.startElement(InterningXmlVisitor.java:60)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.startElement(SAXConnector.java:153)
at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:229)
at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:266) …

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web-services cxf jax-ws jaxb java-8

Cha*_*had

2017 05-23

6
推荐指数

1
解决办法

2261
查看次数