java-8

问题 I have a requirement to convert certain bash scripts to java and one such script connects to a server using openssl with a vanity-url as a parameter to check if that is connectable using that vanity-url . See command below /usr/bin/openssl s_client -connect api.sys.found1.cf.company.com:443 -servername www.app.company.com 2>/dev/null I wanted to do the similar activity in java and test the connectivity. Any ideas on how to make a open-ssl connection using Java .. Is this something that I need

问题 I'm using Java 8 with Android Studio and Retrolambda plugin to compile lambdas to anonymous classes (because Java 8 is not supported on Android). The IDE shows me warnings (or tips) how to change my code to use all the features of Java 8. One of these features is "Can be replaced with foreach call" when you loop over collection. I want to suppress this kind of warning, but I can't figure out how to do this. The simplest solution to suppress this kind of warning is the @SuppressWarnings("all")

问题 I was reading about the Java 8 features and I saw that they have method references, but I did not see how to specify which method when the method is overloaded. Does anyone know? 回答1: From this Lambda FAQ: Where can lambda expressions be used? Method or constructor arguments, for which the target type is the type of the appropriate parameter. If the method or constructor is overloaded, the usual mechanisms of overload resolution are used before the lambda expression is matched to the target

问题 Suppose you have structure classes like this: public class Review{ private Integer idReview; private String description; private ArrayList<RelReviewImage> images; } public class RelReviewImage{ private Integer idRelReviewImage; private Integer idImage; private String name; } With Java 8 and Stream s we want to do a filter for idImage and return Review objects. Is it possible? One level is easy, but 2 levels we can't find any example or documentation. 回答1: Guess what you need: (Assume getters

问题 I'm not really understanding Temporal Adjusters or Java's new time library even after reading numerous tutorials. How would I convert an Instant object to a LocalTime object. I was thinking something along the lines of the following: LocalTime time = LocalTime.of( instantStart.get(ChronoField.HOUR_OF_DAY), instantStart.get(ChronoField.MINUTE_OF_HOUR) ); But it isn't working. How would I do this? 回答1: The way I understand it... Instant is a UTC style time, agnostic of zone always UTC.

问题 I'm using RestAssured 2.8.0 and I'm trying to set my own timeout (for gateway timeout), so if I don't get response after X milliseconds I want to abort. I tried: public static ValidatableResponse postWithConnectionConfig(String url, String body, RequestSpecification requestSpecification, ResponseSpecification responseSpecification) { ConnectionConfig.CloseIdleConnectionConfig closeIdleConnectionConfig = new ConnectionConfig.CloseIdleConnectionConfig(1L, TimeUnit.MILLISECONDS);

问题 I'm using RestAssured 2.8.0 and I'm trying to set my own timeout (for gateway timeout), so if I don't get response after X milliseconds I want to abort. I tried: public static ValidatableResponse postWithConnectionConfig(String url, String body, RequestSpecification requestSpecification, ResponseSpecification responseSpecification) { ConnectionConfig.CloseIdleConnectionConfig closeIdleConnectionConfig = new ConnectionConfig.CloseIdleConnectionConfig(1L, TimeUnit.MILLISECONDS);

问题 Not for-each block: public void cleanup4(){ long timestamp = Instant.now().minus(90l, ChronoUnit.DAYS) .toEpochMilli(); String cql = "SELECT * FROM usertoken"; ResultSet rs = CassandraTools.getInstance().execute(cql,ConsistencyLevel.QUORUM); CassandraConverter cassandraConverter=new MappingCassandraConverter(); CassandraConverterRowCallback<UserTokenCassandra> callback= new CassandraConverterRowCallback<UserTokenCassandra>(cassandraConverter, UserTokenCassandra.class); UserTokenCassandra utc

问题 I am getting this error "Expecting a stackmap frame at this location". I am using Java 8. I know that for Java 7 there is a workaround to use -XX:-UseSplitVerifier to use the less strict verification method. However that option was removed in Java 8. I was wondering if there is any other solution for this. Switching to an earlier Java is not an option. 回答1: The option -XX:-UseSplitVerifier was intended to give bytecode library and tool developers time to catch up and fix problems with

问题 I would like to only have JDK 8 installed on my system, and have the ant javac compile action create working classfiles for a java 6 environment. This sort of works if I syntactically only use java 6 compliant code, but my code can access methods/classes of the java 8 API and still be java 6 compliant according to ant's compile action. This is even the case when using the "javac" task attributes "source" and "target" set to java 6. I am aware that this generates the following warning: [javac]