1.在java代码中写scala代码

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              <plugin>
                <groupId>net.alchim31.maven</groupId>
                <artifactId>scala-maven-plugin</artifactId>
                <version>3.2.0</version>
                <executions>
                    <execution>
                        <id>scala-compile-first</id>
                        <phase>process-resources</phase>
                        <goals>
                            <goal>add-source</goal>
                            <goal>compile</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>test-compile-scala</id>
                        <phase>test-compile</phase>
                        <goals>
                            <goal>add-source</goal>
                            <goal>testCompile</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <scalaVersion>${scala.binary.version}</scalaVersion>
                </configuration>
            </plugin>

2.为了减少定位问题成本，使用jdk1.8，不然会出现各种诡异问题

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3.dubbo中使用jdk

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shopt -s expand_aliases
export JAVA_HOME="/usr/local/jdk18"
alias java="/usr/local/jdk18/bin/java"
alias nohup=":;"

wiki：

4.jar包冲突

使用mvn dependency:tree排除低版本jar包

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5.spark启动异常

Exception in thread "main" java.net.BindException: Cannot assign requested address: bind: Service 'sparkDriver' failed after 16 retries (on a random free port)! 
Consider explicitly setting the appropriate binding address for the service 'sparkDriver' (for example spark.driver.bindAddress for SparkDriver) to the correct binding address.

添加SPARK_LOCAL_IP变量，整合dubbo在init.sh中添加export SPARK_LOCAL_IP="127.0.0.1"

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