我们正在Jenkins上构建一个大型的多模块Maven项目,包括运行大量的单元测试.
每隔几个构建版本构建失败NoClassDefFoundError on RunListener- 它位于单元jar中.从下面的日志中可以看出 - JUnit包含在类路径中.
该错误似乎完全随机出现.
日志
Waiting for Jenkins to finish collecting data
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.17:test (default-test) on project taboola-svc: Execution default-test of goal org.apache.maven.plugins:maven-surefire-plugin:2.17:test failed: A required class was missing while executing org.apache.maven.plugins:maven-surefire-plugin:2.17:test: org/junit/runner/notification/RunListener
[ERROR] -----------------------------------------------------
[ERROR] realm = plugin>org.apache.maven.plugins:maven-surefire-plugin:2.17
[ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
[ERROR] urls[0] = file:/home/builder/.m2/repository/org/apache/maven/plugins/maven-surefire-plugin/2.17/maven-surefire-plugin-2.17.jar
[ERROR] urls[1] = file:/home/builder/.m2/repository/org/apache/maven/surefire/surefire-junit47/2.17/surefire-junit47-2.17.jar
[ERROR] urls[2] = file:/home/builder/.m2/repository/org/apache/maven/surefire/common-junit48/2.17/common-junit48-2.17.jar
[ERROR] urls[3] = file:/home/builder/.m2/repository/org/apache/maven/surefire/common-junit4/2.17/common-junit4-2.17.jar
[ERROR] urls[4] = file:/home/builder/.m2/repository/org/apache/maven/surefire/common-junit3/2.17/common-junit3-2.17.jar
[ERROR] urls[5] = file:/home/builder/.m2/repository/org/apache/maven/surefire/surefire-grouper/2.17/surefire-grouper-2.17.jar
[ERROR] urls[6] = …在我的生产代码中,我在枚举的构造函数中构造一个EnumSet,但它无法检测到我的类是一个实际的枚举.这个错误打破了我的真实生产代码
为了测试目的,我编写了下面的类,但即使使用这个小例子,它仍然无法识别枚举.我如何将我的类标记为EnumSet知道它是枚举的方式的枚举？
简单的源代码:
package test;
import java.util.*; // Set, EnumSet, Arrays
public enum Alphabet {
A,
B(A),
C(A, B),
D(A, B, C),
// You get the point
;
Set<Alphabet> prevLetters;
Alphabet() {
prevLetters = EnumSet.noneOf(Alphabet.class); // <- EnumSet here
}
Alphabet(Alphabet... prev) {
this();
prevLetters.addAll(Arrays.asList(prev));
}
public static void main(String[] args) {
System.out.println(Arrays.toString(Alphabet.values()));
}
}
例外:
Exception in thread "main" java.lang.ExceptionInInitializerError
Caused by: java.lang.ClassCastException: class test.Alphabet not an enum
at java.util.EnumSet.noneOf(EnumSet.java:112)
at test.Alphabet.<init>(Test.java:13)
at test.Alphabet.<clinit>(Test.java:4)
我正在使用vue-google-maps,我已经实现了插件,它运行完美,但是有一个小问题(或者我可能无法正确执行).当我实现自动完成功能时,它以一种方式工作.我输入地址,地图将我指向所选位置,但是当我拖动指针时,它不会更新搜索字段中的地址. 我正在使用Vuejs 2 和vue-google-maps
这就是我在做的事情:
<template>
<div>
<label>
AutoComplete
<GmapAutocomplete :position.sync="markers[0].position" @keyup.enter="usePlace" @place_changed="setPlace">
</GmapAutocomplete>
<button @click="usePlace">Add</button>
</label>
<br/>
<gmap-map
:center="center"
:zoom="7"
map-type-id="terrain"
style="width: 100%; height: 500px"
>
<gmap-marker
@dragend="updateMaker"
:key="index"
v-for="(m, index) in markers"
:position="m.position"
:clickable="true"
:draggable="true"
@click="center=m.position"
></gmap-marker>
</gmap-map>
</div>
</template>
<script>
export default {
data() {
return {
center: {lat: 10.0, lng: 10.0},
markers: [{
position: {lat: 11.0, lng: 11.0}
}],
place: null,
}
},
description: 'Autocomplete Example (#164)',
methods: {
setPlace(place) {
this.place = …当尝试使用netty写入时,写入的数据永远不会在远程端结束,并通过Wireshark确认.
我试过了:
//Directly using writeAndFlush
channel.writeAndFlush(new Packet());
//Manually flushing
channel.write(new Packet());
channel.flush();
// Even sending bytes won't work:
channel.writeAndFlush(new byte[]{1,2,3});
当我把它包起来时没有被捕获 try{...}catch(Throwable e){e.printStackTrace();}
我该怎么做来调试这个问题？
我有一个简单的Hello.java类,我想把它放在一个网站上.
public class Hello {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
我试着这样做
jar cf Hello.jar Hello.java
然后在网站上尝试让它运行我放
<h2> Hello Test </h2>
<APPLET
CODE="Hello.class"
WIDTH="50%" HEIGHT="50"
ARCHIVE = "Hello.jar"
> This example uses a Hello.jar applet.
</APPLET>
不用说它不起作用.