因此,API 0.8.2 中生产者的 Kakfa 配置属性发生了变化;在过去工作并让我的 java Producer 编译之后,我得到了一个异常。生产者针对我的 Kafka_2.9.1-0.8.2.1 集群的节点,我得到了关于DefaultSerializer
未实例化的异常:
Exception in thread "main" org.apache.kafka.common.KafkaException: Could not instantiate class kafka.serializer.DefaultEncoder Does it have a public no-argument constructor?
at org.apache.kafka.common.utils.Utils.newInstance(Utils.java:235)
at org.apache.kafka.common.config.AbstractConfig.getConfiguredInstance(AbstractConfig.java:136)
at org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:216)
........
鉴于这是在 Kakfa 中实现的,我想知道将 Kafka 作为依赖项进行编译是否不够,因为我可能需要在运行时打包一个或多个 Kafka jar。我还没有找到关于此的文档(最新的或其他的)。是否有我缺少的生产者运行时 jar?
作为参考,我在build.gradle
这里包括了我的(有点乱)。编译中的排除项是在已经收到此错误之后的新增内容,因此无论是否依赖项块中的这些行都会发生错误。我确实尝试只依赖kafka-client
0.8.2 的模块,但我认为这不适用于制作人。这是文件:
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.google.protobuf:protobuf-gradle-plugin:0.7.0'
}
}
group 'lamblin'
version '0.1-SNAPSHOT'
apply plugin: 'application'
apply plugin: "com.google.protobuf"
sourceCompatibility = 1.7
targetCompatibility = 1.7
// Eliminates bootstrap class warning from javac
//tasks.withType(Compile) {
// options.bootClasspath = "$JDK6_HOME/jre/lib/rt.jar"
//}
repositories {
mavenCentral()
}
dependencies {
testCompile group: 'junit', name: 'junit', version: '4.11'
compile group: 'com.google.guava', name: 'guava', version: '18.0'
compile group: 'com.google.protobuf', name: 'protobuf-java-util', version: '3.0.0-beta-1'
compile group: 'com.google.transit', name: 'gtfs-realtime-bindings', version: '0.0.4'
compile group: 'com.offbytwo', name: 'docopt', version: '0.6.0.20150202'
//compile group: 'org.apache.kafka', name: 'kafka_2.9.1', version: '0.8.2.1' {
compile ('org.apache.kafka:kafka_2.9.1:0.8.2.1') {
exclude group: 'com.sun.jmx', module: 'jmxri'
exclude group: 'javax.jmx', module: 'jms'
exclude group: 'com.sun.jdmk', module: 'jmxtools'
}
}
protobuf {
generateProtoTasks {
all().each { task ->
task.builtins {
python { }
}
}
}
protoc {
// artifact = 'com.google.protobuf:protoc:3.0.0-alpha-3'
artifact = 'com.google.protobuf:protoc:2.6.1'
}
}
// First Application Script
mainClassName = "com.insight.lamblin.GtfsToJson"
applicationName = "gtfsToJson"
// Subsequent Scripts
task createAllStartScripts() << {
// This task is added to by a loop over the scripts array creating-sub tasks
}
def scripts = [ 'gtfsToJson': 'com.insight.lamblin.GtfsToJson',
'rawGtfsKafkaProducer': 'com.insight.lamblin.RawGtfsKafkaProducer'
]
scripts.each() { scriptName, className ->
def t = tasks.create(name: scriptName+'StartScript', type: CreateStartScripts) {
mainClassName = className
applicationName = scriptName
outputDir = new File(project.buildDir, 'scripts')
classpath = jar.outputs.files + project.configurations.runtime
}
applicationDistribution.into("bin") {
from(t)
fileMode = 0755
}
createAllStartScripts.dependsOn(t)
}