我正在试图连接Hive中的两个ORC表,但是我得到了一个错误。以下是查询:
select t1.num as num, t1.product as Product, t2.value as OldValue, t1.value as NewValue from test_new t1 LEFT OUTER JOIN test_old t2 ON t1.num=t2.num and t1.product=t2.product where t2.value is NULL and t1.value is not NULL or t1.value<>t2.value;
错误:
2017-
编辑:此问题似乎已在Scala2.9.1中得到解决
考虑到以下现有Java库(简化):
public interface IFace<T> {}
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD})
public @interface Anno {
Class<? extends IFace> value();
}
库中有一些方法,这些方法期望用户定义的界面包含一个或多个带有@Anno注释的方法。
我正在探索将现有代码从Java转换为Scala。现有的代码库包含IFace的实现。
p
我正在尝试使用cucumber高级报告,但收到错误:
Exception in thread "main" org.apache.maven.reporting.MavenReportException: Error occured while generating Cucumber usage report
at com.github.mkolisnyk.cucumber.reporting.CucumberUsageReporting.executeReport(CucumberUsageReporting.java:385)
at support.test
我很难理解为什么会出现这个错误:
ERROR: Invalid syntax. Default option is not allowed more than '2' time(s).
Type "SETX /?" for usage.
实现
C:\Users>setx JAVA_HOME "C:\DOC\JDK64\1.8.0.74"
SUCCESS: Specified value was saved.
C:\Users>setx PATH "%PATH%;%JAVA_HOME%\bin"
ERROR: Inv
我正在尝试加载一个java代理,以使用java.lang.instrument.Instrumentation来测量对象的大小。这是我的Java:
package com.example.memory.usage;
import java.lang.instrument.Instrumentation;
import java.util.*;
public class MemoryUsage {
public static void main(String[] args) throws Exception {
Random random = new Rando
为了更新我的数据库,我遵循了以下内容:
以下是我的日志的输出:
android.database.sqlite.SQLiteException: no such table: users (code 1): , while compiling: UPDATE users SET total_usage=? WHERE email =myemail
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.databas
例如,
如果方法返回大量数据,如下所示:
Data[] data = getData(); //will return 100Mb. Java memory usage increased by 100
如果我们调用getData而不给数据赋值,java还会使用这个100Mb吗?
getData(); //returns huge data but we don't assign it to var. Memory usage wasn't increased
我试图为Google generate release key V2,并为此跟踪这个,但我得到了:
keytool error: java.lang.RuntimeException: Usage error, APP.keystore is not a legal command
java.lang.RuntimeException: Usage error, APP.keystore is not a legal command
at sun.security.tools.KeyTool.parseArgs(KeyTool.java:402)
at sun.securit
我正在部署一个在kubernetes用夸夸斯编写的吊舱,而且启动似乎还不错。但是,在准备和活力方面存在一个问题,这会导致不健康。对于度量标准,我使用在端口8080和path上配置的小黑眼度量:
quarkus.smallrye-metrics.path=/metrics
如果我进入吊舱然后执行
curl localhost:8080/metrics
反应是
# HELP base_classloader_loadedClasses_count Displays the number of classes that are currently loaded in the Java virtual
我需要将这些代码转换成Java8Stream,我使用下面给出的代码进行了尝试,但是我仍然没有得到我想要的。
//contractList is list of Contract class
//contract.getProgramId() returns String
//contract.getEnrollmentID() returns String
//'usage = CommonUtils.getUsageType()' is other service to call wich returns String
//enroll and usage are Strin
编写一个程序来执行以下任务。·从命令行获取一个整数参数n。将整数从1打印到n,每一行一个,但对于3的倍数,打印“Flim”代替数字,对于5的倍数,则打印“Flam”而不是数字。对于3和5的倍数,打印“FlimFlam”。
例如,运行java示例6应该生成输出1 2 Flim 4 Flam Flim。
class Example {
public static void main (String argv[]) {
if (argv.length != 1)
usage();
int n = 0;
try {