nacos報錯java.lang.ClassNotFoundException: com.netflix.config.DynamicPropertyFactory

問題背景

使用LoadBalancerClient報錯java.lang.ClassNotFoundException: com.netflix.config.DynamicPropertyFactory

java.lang.ClassNotFoundException: com.netflix.config.DynamicPropertyFactory
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[na:1.8.0_221]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_221]
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) ~[na:1.8.0_221]

解決方案

1 找不到類，說明沒有引入這個依賴，然后看了一下nacos引入了，，但排除了很多依賴，這個核心被排除掉了，所以報錯

                <exclusion>
                    <artifactId>archaius-core</artifactId>
                    <groupId>com.netflix.archaius</groupId>
                </exclusion>

2 正常引入的依賴，因為引入了其他很多東西，所以排除了，很多根據(jù)自己需要把排除刪除掉

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-nacos-discovery</artifactId>
            <version>2.2.0.RELEASE</version>
            <exclusions>
                <exclusion>
                    <artifactId>guava</artifactId>
                    <groupId>com.google.guava</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>HdrHistogram</artifactId>
                    <groupId>org.hdrhistogram</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>spring-cloud-commons</artifactId>
                    <groupId>org.springframework.cloud</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>commons-codec</artifactId>
                    <groupId>commons-codec</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>commons-lang3</artifactId>
                    <groupId>org.apache.commons</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>httpclient</artifactId>
                    <groupId>org.apache.httpcomponents</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>spring-cloud-starter</artifactId>
                    <groupId>org.springframework.cloud</groupId>
                </exclusion>
            </exclusions>
        </dependency>

nacos啟動常見錯誤

1. Could not find or load main class

Error: Could not find or load main class
Caused by: java.lang.ClassNotFoundException:

解決辦法：

x JAVA_OPT_EXT_FIX="-Djava.ext.dirs=${JAVA_HOME}/jre/lib/ext:${JAVA_HOME}/lib/ext"
√ JAVA_OPT="${JAVA_OPT} -Djava.ext.dirs=${JAVA_HOME}/jre/lib/ext:${JAVA_HOME}/lib/ext"
x echo "$JAVA $JAVA_OPT_EXT_FIX ${JAVA_OPT}"
√ echo "$JAVA ${JAVA_OPT}"
x echo "$JAVA $JAVA_OPT_EXT_FIX ${JAVA_OPT}" > ${BASE_DIR}/logs/start.out 2>&1 &
x nohup "$JAVA" "$JAVA_OPT_EXT_FIX" ${JAVA_OPT} nacos.nacos >> ${BASE_DIR}/logs/start.out 2>&1 &
√ echo "$JAVA ${JAVA_OPT}" > ${BASE_DIR}/logs/start.out 2>&1 &
√ nohup $JAVA ${JAVA_OPT} nacos.nacos >> ${BASE_DIR}/logs/start.out 2>&1 &

2. Please set the JAVA_HOME variable in your environment

which: no javac in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)
readlink: missing operand
Try 'readlink --help' for more information.
dirname: missing operand
Try 'dirname --help' for more information.
ERROR: Please set the JAVA_HOME variable in your environment, We need java(x64)! jdk8 or later is better! !!

查找原因：

• 輸入echo $JAVA_HOME結(jié)果為空
• 說明沒有配置java環(huán)境變量

解決辦法：

• 配置JAVA環(huán)境變量

2.1 找到j(luò)dk安裝路徑

[root@localhost bin]# ls -lrt /usr/bin/java
lrwxrwxrwx 1 root root 22 Mar 15 09:59 /usr/bin/java -> /etc/alternatives/java
[root@localhost bin]# ls -lrt /etc/alternatives/java
lrwxrwxrwx 1 root root 73 Mar 15 09:59 /etc/alternatives/java -> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64/jre/bin/java
[root@localhost bin]# cd /usr/lib/jvm
[root@localhost jvm]# ll
total 4
drwxr-xr-x 3 root root 4096 Mar 15 09:59 java-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64
lrwxrwxrwx 1 root root   21 Mar 15 09:59 jre -> /etc/alternatives/jre
lrwxrwxrwx 1 root root   27 Mar 15 09:59 jre-1.8.0 -> /etc/alternatives/jre_1.8.0
lrwxrwxrwx 1 root root   35 Mar 15 09:59 jre-1.8.0-openjdk -> /etc/alternatives/jre_1.8.0_openjdk
lrwxrwxrwx 1 root root   51 Mar 15 09:59 jre-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64 -> java-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64/jre
lrwxrwxrwx 1 root root   29 Mar 15 09:59 jre-openjdk -> /etc/alternatives/jre_openjdk
2.2 在/etc/profile文件下添加以下代碼并執(zhí)行
export JAVA_HOME=/usr/lib/jvm/jre-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64/          
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH
 
[root@localhost ~]# source /etc/profile

總結(jié)

以上為個人經(jīng)驗，希望能給大家一個參考，也希望大家多多支持腳本之家。

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