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所以我目前正在开发一个 Spring Boot 项目。我想做的是将表从 postgres DB 加载到 Spark DataFrame 以对其使用 SparkSQL 操作。实例化 DataFrame 时(第 34 行)没有错误,但只要我想对其使用任何方法,就会收到此错误:
java.lang.ClassNotFoundException: org.codehaus.janino.InternalCompilerException
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581) ~[na:na]
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[na:na]
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na]
at org.apache.spark.sql.catalyst.expressions.codegen.CodeGenerator$.org$apache$spark$sql$catalyst$expressions$codegen$CodeGenerator$$doCompile(CodeGenerator.scala:1291) ~[spark-catalyst_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.catalyst.expressions.codegen.CodeGenerator$$anon$1.load(CodeGenerator.scala:1383) ~[spark-catalyst_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.catalyst.expressions.codegen.CodeGenerator$$anon$1.load(CodeGenerator.scala:1380) ~[spark-catalyst_2.12-2.4.5.jar:2.4.5]
at org.spark_project.guava.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3599) ~[spark-network-common_2.12-2.4.5.jar:2.4.5]
at org.spark_project.guava.cache.LocalCache$Segment.loadSync(LocalCache.java:2379) ~[spark-network-common_2.12-2.4.5.jar:2.4.5]
at org.spark_project.guava.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2342) ~[spark-network-common_2.12-2.4.5.jar:2.4.5]
at org.spark_project.guava.cache.LocalCache$Segment.get(LocalCache.java:2257) ~[spark-network-common_2.12-2.4.5.jar:2.4.5]
at org.spark_project.guava.cache.LocalCache.get(LocalCache.java:4000) ~[spark-network-common_2.12-2.4.5.jar:2.4.5]
at org.spark_project.guava.cache.LocalCache.getOrLoad(LocalCache.java:4004) ~[spark-network-common_2.12-2.4.5.jar:2.4.5]
at org.spark_project.guava.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4874) ~[spark-network-common_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.catalyst.expressions.codegen.CodeGenerator$.compile(CodeGenerator.scala:1238) ~[spark-catalyst_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.catalyst.expressions.codegen.GenerateSafeProjection$.create(GenerateSafeProjection.scala:204) ~[spark-catalyst_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.catalyst.expressions.codegen.GenerateSafeProjection$.create(GenerateSafeProjection.scala:38) ~[spark-catalyst_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.catalyst.expressions.codegen.CodeGenerator.generate(CodeGenerator.scala:1193) ~[spark-catalyst_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.Dataset.collectFromPlan(Dataset.scala:3388) ~[spark-sql_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.Dataset.$anonfun$head$1(Dataset.scala:2550) ~[spark-sql_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.Dataset.$anonfun$withAction$2(Dataset.scala:3370) ~[spark-sql_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.execution.SQLExecution$.$anonfun$withNewExecutionId$1(SQLExecution.scala:80) ~[spark-sql_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.execution.SQLExecution$.withSQLConfPropagated(SQLExecution.scala:127) ~[spark-sql_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:75) ~[spark-sql_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.Dataset.withAction(Dataset.scala:3370) ~[spark-sql_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.Dataset.head(Dataset.scala:2550) ~[spark-sql_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.Dataset.take(Dataset.scala:2764) ~[spark-sql_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.Dataset.getRows(Dataset.scala:254) ~[spark-sql_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.Dataset.showString(Dataset.scala:291) ~[spark-sql_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.Dataset.show(Dataset.scala:751) ~[spark-sql_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.Dataset.show(Dataset.scala:710) ~[spark-sql_2.12-2.4.5.jar:2.4.5]
at org.apache.spark.sql.Dataset.show(Dataset.scala:719) ~[spark-sql_2.12-2.4.5.jar:2.4.5]
at com.karakun.spark.SparkController.queryOnData(SparkController.java:45) ~[main/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:645) ~[javax.servlet-api-4.0.1.jar:4.0.1]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:750) ~[javax.servlet-api-4.0.1.jar:4.0.1]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.35.jar:9.0.35]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:118) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:158) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.java:204) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:92) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:77) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) ~[spring-security-web-5.3.2.RELEASE.jar:5.3.2.RELEASE]
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.6.RELEASE.jar:5.2.6.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.35.jar:9.0.35]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
这是我的代码:
import org.apache.spark.SparkContext;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.sql.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import static org.apache.spark.sql.functions.col;
@RestController
public class SparkController {
private static final Logger LOGGER = LoggerFactory.getLogger(SparkController.class);
private final SparkService sparkService;
public SparkController(@Autowired SparkService sparkService){
this.sparkService = sparkService;
}
@GetMapping("data-read")
public void queryOnData() throws AnalysisException {
SparkSession spark = SparkSession
.builder()
.appName("Spark SQL basic example")
.getOrCreate();
SparkContext sc = spark.sparkContext();
Dataset<Row> jdbcDataFrame = spark.read()
.format("jdbc")
.option("url", "jdbc:postgresql://localhost:5432/postgres")
.option("dbtable", "test")
.option("user", "admin")
.option("password", "admin")
.load();
jdbcDataFrame.filter(col("age").gt(21)).show();
}
}
这是我的 build.gradle 文件:
plugins {
id 'org.springframework.boot' version '2.3.0.RELEASE'
id 'io.spring.dependency-management' version '1.0.9.RELEASE'
id "com.google.protobuf" version "0.8.12"
id 'base'
id 'java'
id 'war'
}
apply plugin: 'java'
apply plugin: 'com.google.protobuf'
apply plugin:'base'
apply plugin: 'io.spring.dependency-management'
group 'org.example'
version '1.0'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
configurations.all {
exclude module: 'slf4j-log4j12'
}
dependencies {
testImplementation group: 'org.junit.jupiter', name: 'junit-jupiter-api', version: '5.6.2'
testImplementation group: 'org.springframework.boot', name: 'spring-boot-starter-test', version: '2.3.0.RELEASE'
implementation('com.google.protobuf:protobuf-java:3.11.4')
implementation ("com.google.protobuf:protobuf-java-util:3.11.4")
implementation('org.springframework.boot:spring-boot-starter-web')
implementation('org.springframework.boot:spring-boot-starter-security:2.3.0.RELEASE')
implementation('org.postgresql:postgresql:42.2.12')
implementation('org.apache.spark:spark-core_2.12:2.4.5')
implementation('org.apache.spark:spark-sql_2.12:2.4.5')
implementation("org.codehaus.janino:commons-compiler:3.0.8")
}
protobuf {
protoc {
artifact = "com.google.protobuf:protoc:3.11.4"
}
}
sourceSets {
main {
java {
srcDir "build/generated/source/proto/main/java"
}
}
}
最佳答案
我假设你需要添加依赖
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.codehaus.janino</groupId>
<artifactId>commons-compiler</artifactId>
<version>3.0.8</version>
</dependency>
</dependencies>
</dependencyManagement>
此 https://issues.apache.org/jira/browse/SPARK-23605 存在 Spark 问题
关于java - 无法对任何实例化的 Spark 数据结构进行操作?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/62195978/
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如何仅使用 css 将附加图像 html 化? 如果用纯 css 做不到,那我怎么能至少用一个图像来做 最佳答案 这不是真正的问题,而是您希望我们为您编写代码。我建议您搜索“css breadcrum
以下是 Joshua 的 Effective Java 的摘录: If you do synchronize your class internally, you can use various te
在这里工作时,我们有一个框向业务合作伙伴提供 XML 提要。对我们的提要的请求是通过指定查询字符串参数和值来定制的。其中一些参数是必需的,但很多不是。 例如,我们要求所有请求都指定一个 GUID 来标
我有 3 个缓冲区,其中包含在 32 位处理器上运行的 R、G、B 位数据。 我需要按以下方式组合三个字节: R[0] = 0b r1r2r3r4r5r6r7r8 G[0] = 0b g1g2g3g4
我最近发现了关于如何使用 History.js、jQuery 和 ScrollTo 通过 HTML5 History API 对网站进行 Ajax 化的要点:https://github.com/br
我们有一个 Spring Boot 应用程序,由于集成需要,它变得越来越复杂——比如在你这样做之后发送一封电子邮件,或者在你之后广播一条 jms 消息等等。在寻找一些更高级别的抽象时,我遇到了 apa
我正在尝试首次实施Google Pay。我面临如何指定gateway和gatewayMarchantId的挑战。 我所拥有的是google console帐户,不知道在哪里可以找到此信息。 priva
昨天下午 3 点左右,我为两个想要从一个 Azure 帐户转移到另一个帐户的网站设置了 awverify 记录。到当天结束时,Azure 仍然不允许我添加域,所以我赌了一把,将域和 www 子域重新指
我正在使用terms facet在elasticsearch服务器中获取顶级terms。现在,我的标签"indian-government"不被视为一个标签。将其视为"indian" "governm
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