java-8

问题 I am using spark-sql-2.4.1v with java8. I have following scenario val df = Seq( ("0.9192019", "0.1992019", "0.9955999"), ("0.9292018", "0.2992019", "0.99662018"), ("0.9392017", "0.3992019", "0.99772000")).toDF("item1_value","item2_value","item3_value") .withColumn("item1_value", $"item1_value".cast(DoubleType)) .withColumn("item2_value", $"item2_value".cast(DoubleType)) .withColumn("item3_value", $"item3_value".cast(DoubleType)) df.show(20) I need an expected output something like this ------

问题 I am using spark-sql-2.4.1v with java8. I have following scenario val df = Seq( ("0.9192019", "0.1992019", "0.9955999"), ("0.9292018", "0.2992019", "0.99662018"), ("0.9392017", "0.3992019", "0.99772000")).toDF("item1_value","item2_value","item3_value") .withColumn("item1_value", $"item1_value".cast(DoubleType)) .withColumn("item2_value", $"item2_value".cast(DoubleType)) .withColumn("item3_value", $"item3_value".cast(DoubleType)) df.show(20) I need an expected output something like this ------

问题 I am new to java 8 and I am trying to get five years before now, here is my code: Instant fiveYearsBefore = Instant.now().plus(-5, ChronoUnit.YEARS); But I get the following error: java.time.temporal.UnsupportedTemporalTypeException: Unsupported unit: Years Can anyone help me how to do that? 回答1: ZonedDateTime.now().minusYears(5).toInstant() That will use your default time zone to compute the time. If you want another one, specify it in now() . For example: ZonedDateTime.now(ZoneOffset.UTC)

问题 I have a set of two hours ranges 10 PM - 02 AM 01 AM - 08 AM I want to check if any of them over lap regardless of the the date. For Example: The first range could be on 1st and 2nd of Aug while the second range could be 10th of Aug. This is what I have so far private Interval createInterval(final OpeningClosingTimesEntry entry) { LocalDateTime openingHour = LocalDateTime.fromDateFields(entry.getOpenTime()); LocalDateTime closingHour = LocalDateTime.fromDateFields(entry.getCloseTime()); if

问题 On Ant Apt trying to build ant apt task on java 1.8 will crash. But in application that i have to change i must use this task because it is built with ant Anyone have any idea how to avoid this crash and run Ant apt task on java 1.8? 回答1: If you are using java8; then you don't need to run the apt task directly; it can happen behind the scenes. From ANT's own documentation : This task runs on Java 1.5 to Java 1.7. Apt is deprecated in Java 1.6, which can run annotation processors as part of

问题 On Ant Apt trying to build ant apt task on java 1.8 will crash. But in application that i have to change i must use this task because it is built with ant Anyone have any idea how to avoid this crash and run Ant apt task on java 1.8? 回答1: If you are using java8; then you don't need to run the apt task directly; it can happen behind the scenes. From ANT's own documentation : This task runs on Java 1.5 to Java 1.7. Apt is deprecated in Java 1.6, which can run annotation processors as part of

问题 On Ant Apt trying to build ant apt task on java 1.8 will crash. But in application that i have to change i must use this task because it is built with ant Anyone have any idea how to avoid this crash and run Ant apt task on java 1.8? 回答1: If you are using java8; then you don't need to run the apt task directly; it can happen behind the scenes. From ANT's own documentation : This task runs on Java 1.5 to Java 1.7. Apt is deprecated in Java 1.6, which can run annotation processors as part of

问题 java.lang.IllegalArgumentException at sun.security.provider.certpath.AdaptableX509CertSelector.setSerialNumber(AdaptableX509CertSelector.java:107) at java.security.cert.X509CertSelector.(X509CertSelector.java:283) at sun.security.provider.certpath.AdaptableX509CertSelector.(AdaptableX509CertSelector.java:50) at sun.security.provider.certpath.PKIXCertPathValidator.validate(PKIXCertPathValidator.java:93) at sun.security.provider.certpath.PKIXCertPathValidator.engineValidate

问题 I am trying to figure out how to test a web/rest services written in Java Spark and there is not many tutorials on how to do that. It is tricky to find answers due to confusion between Apache Spark and Java Spark . I came across this resource but, I couldn't get it to work the way I had expected. There is also this resource and examples in Java Spark github but they all probably use embedded server. Anyway, Assuming that I have the following service public class RestService implements

问题 I am trying to figure out how to test a web/rest services written in Java Spark and there is not many tutorials on how to do that. It is tricky to find answers due to confusion between Apache Spark and Java Spark . I came across this resource but, I couldn't get it to work the way I had expected. There is also this resource and examples in Java Spark github but they all probably use embedded server. Anyway, Assuming that I have the following service public class RestService implements