MapperBuilder 的 NoClassDefFoundError

Question

我正在为 JMeter 开发插件，作为该过程的一部分，我们添加了一些第三方库。

当我运行应用程序时，出现错误：

java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/cfg/MapperBuilder
    at io.lindstrom.mpd.MPDParser.defaultObjectMapper(MPDParser.java:57) ~[mpd-parser-0.6.jar:?]
    at io.lindstrom.mpd.MPDParser.<init>(MPDParser.java:33) ~[mpd-parser-0.6.jar:?]
    at com.blazemeter.jmeter.hls.logic.HlsSampler.sample(HlsSampler.java:237) ~[jmeter-bzm-hls-2.0-SNAPSHOT.jar:?]
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1220) ~[ApacheJMeter_http.jar:5.1.1 r1855137]
    at org.apache.jmeter.threads.JMeterThread.doSampling(JMeterThread.java:622) ~[ApacheJMeter_core.jar:5.1.1 r1855137]
    at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:546) ~[ApacheJMeter_core.jar:5.1.1 r1855137]
    at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:486) ~[ApacheJMeter_core.jar:5.1.1 r1855137]
    at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:253) ~[ApacheJMeter_core.jar:5.1.1 r1855137]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_211]
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.cfg.MapperBuilder
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[?:1.8.0_211]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_211]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_211]
    ... 9 more

我一直在添加库，因为 ClassNotFoundException "requesting" 但是，这个，我找不到修复。

Answer 1

依赖的 jar 不存在，这导致 class 未找到异常。将 jackson-databind https://github.com/FasterXML/jackson-databind jar 添加到 jmeter 外部库 JMETER_HOME/lib/ext/ 文件夹。

Answer 2

缺少类来自 jackson-databind jar

您应该将插件的依赖 jar 放在 lib folder 中（尽管插件 jar 本身在 lib/ext 文件夹中）

JMeter automatically finds classes from jars in the following directories:

JMETER_HOME/lib used for utility jars JMETER_HOME/lib/ext used for JMeter components and plugins

If you have developed new JMeter components, then you should jar them and copy the jar into JMeter's lib/ext directory. JMeter will automatically find JMeter components in any jars found here. Do not use lib/ext for utility jars or dependency jars used by the plugins

MapperBuilder 的 NoClassDefFoundError

NoClassDefFoundError for MapperBuilder

java

jmeter

libraries