对于RatpackServer的启动方法，我有一点非常难以理解（对我而言）。
Fristly，我的意思是这个方法
static RatpackServer start(Action<? super RatpackServerSpec> definition)
throws Exception
这是我的代码：
public static void main(String... args) throws Exception {
ProgramInitializer programInitializer = new ProgramInitializer();
programInitializer.initialize();
RatpackServer.start(b -> b
.serverConfig(s -> s
.baseDir(BaseDir.find())
.env()
)
.registry(
Guice.registry(s -> s
.module(TextTemplateModule.class, conf ->
conf.setStaticallyCompile(true)
)
.bindInstance(ServerErrorHandler.class, (ctx, error) -> {
logger.error("Unexpected error", error);
ctx.render(groovyTemplate("error500.html"));
})
.bindInstance(ClientErrorHandler.class, (ctx, statusCode) -> {
ctx.getResponse().status(statusCode);
if (statusCode == 404) {
ctx.render(groovyTemplate("error404.html"));
} else if (statusCode == 401) {
ctx.render(groovyTemplate("error401.html"));
} else if (statusCode == 403) {
ctx.render(groovyTemplate("error403.html"));
} else {
logger.error("Unexpected: {}", statusCode);
}
})
)
)
.handlers(c -> { c
.get("index.html", ctx -> {
//ctx.redirect(301, "/");
logger.debug("Retrieving user profile...");
final Map<String, Object> model = Maps.newHashMap();
RatpackPac4j.userProfile(ctx)
.route(Optional::isPresent, p -> {
model.put("profile", p);
ctx.render(groovyTemplate(model, "index.html"));
})
.then(p -> {
ctx.render(groovyTemplate(model, "index.html"));
});
//
})
//.get(ctx -> ctx.render(groovyTemplate("index.html")))
.get("hello", ctx -> {
RelativisticModel.select();
//String energy = System.getenv("ENERGY");
//Amount<Mass> m = Amount.valueOf(energy).to(KILOGRAM);
ctx.render(programInitializer.getTweetsList());
})
.files(f -> f.dir("public"));
}
)
);
}
一切顺利，直到我将此依赖项添加到build.gradle：
compile 'io.ratpack:ratpack-pac4j:1.3.3'
这样整个文件看起来像这样：
group 'pl.edu.agh.tai.tdo'
version '1.0'
apply plugin: 'java'
apply plugin: 'idea'
buildscript {
repositories {
maven { url "http://oss.jfrog.org/repo" }
mavenCentral()
maven { url "http://dl.bintray.com/robfletcher/gradle-plugins" }
maven { url "https://oss.sonatype.org/content/repositories/snapshots" }
jcenter()
}
dependencies {
classpath "io.ratpack:ratpack-gradle:1.0.0"
classpath ('org.ratpack-framework:ratpack-gradle:0.9.0-SNAPSHOT')
}
}
apply plugin: "io.ratpack.ratpack-groovy"
repositories {
maven { url "http://oss.jfrog.org/repo" }
mavenCentral()
maven { url "http://repo.springsource.org/repo" } // for springloaded
maven { url "https://oss.sonatype.org/content/repositories/snapshots" }
jcenter()
}
mainClassName = "pl.edu.agh.tai.tdo.Main"
dependencies {
compile "org.ratpack-framework:ratpack-handlebars:0.9.0-SNAPSHOT"
runtime "org.slf4j:slf4j-simple:1.7.12"
compile "com.heroku.sdk:heroku-jdbc:0.1.1"
compile "org.postgresql:postgresql:9.4-1201-jdbc4"
compile "org.jscience:jscience:4.3.1"
compile 'io.ratpack:ratpack-pac4j:1.2.0'
compile 'org.twitter4j:twitter4j-core:4.0.4'
compile 'ch.qos.logback:logback-classic:1.1.7'
testCompile group: 'junit', name: 'junit', version: '4.11'
}
sourceSets {
main.java.srcDir "src/main/java"
main.resources.srcDirs "src/main/resources"
test.java.srcDir "src/test/java"
}
task stage {
dependsOn installDist
}
在Main类中添加此依赖项
Error:java: incompatible types: com.google.inject.Injector is not a functional interface
multiple non-overriding abstract methods found in interface com.google.inject.Injector
Error:(29, 22) java: method start in interface ratpack.server.RatpackServer cannot be applied to given types; required: no
arguments found: (b)->b.ser[...]); })
reason: actual and formal argument lists differ in length
Error:(63, 56) java: invalid method reference
非静态方法isPresent（）不能从静态上下文引用
在IntelliJ中的RatpackServer.start（...）上面写了
Non-static method start() cannot be referenced from a static context
有没有这样的问题？这对我来说真的很神秘。我尝试基于Ratpack构建我的第一个应用程序...
答案 0 :(得分：1)
您似乎正在混合和匹配Ratpack的多个版本。
在您的构建文件中，我找到：
您使用的RatpackServer版本没有start方法作为静态方法。
我已经为您修复了构建gradle文件：
plugins {
id 'io.ratpack.ratpack-groovy' version '1.3.3' // downloads ratpack-groovy 1.3.3 which is latest as of 2016-05-12
id 'idea' // new way of applying idea plugin
}
group 'pl.edu.agh.tai.tdo'
version '1.0'
repositories {
maven { url "http://oss.jfrog.org/repo" }
mavenCentral()
maven { url "https://oss.sonatype.org/content/repositories/snapshots" }
jcenter()
}
mainClassName = "pl.edu.agh.tai.tdo.Main"
dependencies {
compile ratpack.dependency('handlebars') // use ratpack gradle plugin to ensure that ratpack-handlebars 1.3.3 is used
compile ratpack.dependency('pac4j') // use ratpack gradle plugin to ensure that ratpack-pac4j 1.3.3 is used
runtime "org.slf4j:slf4j-simple:1.7.12"
compile "com.heroku.sdk:heroku-jdbc:0.1.1"
compile "org.postgresql:postgresql:9.4-1201-jdbc4"
compile "org.jscience:jscience:4.3.1"
compile 'org.twitter4j:twitter4j-core:4.0.4'
compile 'ch.qos.logback:logback-classic:1.1.7'
testCompile group: 'junit', name: 'junit', version: '4.11'
}
task stage(dependsOn: installDist)
Ratpack Gradle插件，在您调用
时应用plugins {
id 'io.ratpack.ratpack-groovy' version '1.3.3'
}
提供方法ratpack.dependency，它将引入给定模块的适当版本，例如pac4j。
以下是等效的：
dependencies {
compile ratpack.dependency('pac4j')
}
和
dependencies {
compile 'io.ratpack:ratpack-pac4j:1.3.3'
}