I have a problem compiling simple blocking GET example from the HttpRequest JavaDoc:
package org.example;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import static java.net.http.HttpRequest.noBody;
import static java.net.http.HttpResponse.asString;
public class Http2 {
public static void main(String[] args) throws URISyntaxException, IOException, InterruptedException {
HttpResponse response = HttpRequest
.create(new URI(“http://www.infoq.com”))
.body(noBody())
.GET().response();
int responseCode = response.statusCode();
String responseBody = response.body(asString());
System.out.println(responseBody);
}
}
I’m getting package java.net.http does not exist error when compiling using JDK 9:
{ jdk9 } » /cygdrive/c/Program\ Files/Java/jdk-9/bin/javac -d out/production -modulesourcepath org.example.module1/src/ -m org.example.module1
org.example.module1\src\org.example.module1\org\example\Http2.java:6: error: package java.net.http does not exist
import java.net.http.HttpRequest;
^
org.example.module1\src\org.example.module1\org\example\Http2.java:7: error: package java.net.http does not exist
import java.net.http.HttpResponse;
^
org.example.module1\src\org.example.module1\org\example\Http2.java:9: error: package java.net.http does not exist
import static java.net.http.HttpRequest.noBody;
^
org.example.module1\src\org.example.module1\org\example\Http2.java:9: error: static import only from classes and interfaces
import static java.net.http.HttpRequest.noBody;
^
org.example.module1\src\org.example.module1\org\example\Http2.java:10: error: package java.net.http does not exist
import static java.net.http.HttpResponse.asString;
^
org.example.module1\src\org.example.module1\org\example\Http2.java:10: error: static import only from classes and interfaces
import static java.net.http.HttpResponse.asString;
^
org.example.module1\src\org.example.module1\org\example\Http2.java:14: error: cannot find symbol
HttpResponse response = HttpRequest
^
symbol: class HttpResponse
location: class Http2
org.example.module1\src\org.example.module1\org\example\Http2.java:14: error: cannot find symbol
HttpResponse response = HttpRequest
^
symbol: variable HttpRequest
location: class Http2
org.example.module1\src\org.example.module1\org\example\Http2.java:16: error: cannot find symbol
.body(noBody())
^
symbol: method noBody()
location: class Http2
org.example.module1\src\org.example.module1\org\example\Http2.java:19: error: cannot find symbol
String responseBody = response.body(asString());
^
symbol: method asString()
location: class Http2
10 errors
Same error occurs using command line and IntelliJ.
It is not a problem with my module because classes without java.net.http compiles and run without any problem.
Any idea what is going on?
解决方案
In your module definition, located (based on your package name) in src/org/example/module-info.java, you need to add the dependency to the java.net.http package, which is included in the java.httpclient module:
module org.example {
requires java.httpclient;
}
You can find the list of JDK modules in the module summary.