在第七章当我在getUserz之前加上suspend关键字以后，Run程序发生如下问题，不知为何！求大神指点

来源：7-2 协程入门

Savvy1127

2021-02-15

“/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java” -javaagent:/Applications/Android Studio.app/Contents/lib/idea_rt.jar=59317:/Applications/Android Studio.app/Contents/bin -Dfile.encoding=UTF-8 -classpath /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/jre/lib/charsets.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/jre/lib/ext/localedata.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/jre/lib/ext/sunec.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/jre/lib/jce.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/jre/lib/jsse.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/jre/lib/management-agent.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/jre/lib/resources.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/jre/lib/rt.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/lib/dt.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/lib/jconsole.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/lib/sa-jdi.jar:/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/lib/tools.jar:/Users/savypan/Documents/Project/MyKotlin/sampleJvm/build/classes/kotlin/main:/Users/savypan/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-coroutines-jdk8/1.2.1/4d891cee198626c08ac30028afdd743558507ad9/kotlinx-coroutines-jdk8-1.2.1.jar:/Users/savypan/.gradle/caches/modules-2/files-2.1/org.apache.logging.log4j/log4j-api/2.14.0/23cdb2c6babad9b2b0dcf47c6a2c29d504e4c7a8/log4j-api-2.14.0.jar:/Users/savypan/.gradle/caches/modules-2/files-2.1/com.jakewharton.retrofit/retrofit2-kotlin-coroutines-adapter/0.9.2/b3bddf47b1016bfa9e1c5a2d81f8066b33770aec/retrofit2-kotlin-coroutines-adapter-0.9.2.jar:/Users/savypan/.gradle/caches/modules-2/files-2.1/com.squareup.retrofit2/converter-gson/2.5.0/1c96fc5d0230f57d36cd09e2541d10829a3352a7/converter-gson-2.5.0.jar:/Users/savypan/.gradle/caches/modules-2/files-2.1/com.squareup.retrofit2/retrofit/2.5.0/713ce36037bf24a76a3974c05cb85c3f754b1cc3/retrofit-2.5.0.jar:/Users/savypan/.gradle/caches/modules-2/files-2.1/org.apache.commons/commons-lang3/3.9/122c7cee69b53ed4a7681c03d4ee4c0e2765da5/commons-lang3-3.9.jar:/Users/savypan/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-coroutines-swing/1.2.1/6a3e5299e49599d8f5ec493faf2856d04a2cbf0f/kotlinx-coroutines-swing-1.2.1.jar:/Users/savypan/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-coroutines-core/1.2.1/3839faf625f4197acaeceeb6da000f011a2acb49/kotlinx-coroutines-core-1.2.1.jar:/Users/savypan/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.3.31/11289d20fd95ae219333f3456072be9f081c30cc/kotlin-stdlib-1.3.31.jar:/Users/savypan/.gradle/caches/modules-2/files-2.1/com.google.code.gson/gson/2.8.2/3edcfe49d2c6053a70a2a47e4e1c2f94998a49cf/gson-2.8.2.jar:/Users/savypan/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.3.31/20c34a04ea25cb1ef0139598bd67c764562cb170/kotlin-stdlib-common-1.3.31.jar:/Users/savypan/.gradle/caches/modules-2/files-2.1/org.jetbrains/annotations/13.0/919f0dfe192fb4e063e7dacadee7f8bb9a2672a9/annotations-13.0.jar:/Users/savypan/.gradle/caches/modules-2/files-2.1/com.squareup.okhttp3/okhttp/3.12.0/b36f4a04584c0fb0d9af2d3401cdff8dacb1ea54/okhttp-3.12.0.jar:/Users/savypan/.gradle/caches/modules-2/files-2.1/com.squareup.okio/okio/1.15.0/bc28b5a964c8f5721eb58ee3f3c47a9bcbf4f4d8/okio-1.15.0.jar com.example.samplejvm.suspend.GithubServiceKt
21:28:10:360 [main] 3
21:28:10:360 [DefaultDispatcher-worker-1] 1
Exception in thread “DefaultDispatcher-worker-1” java.lang.IllegalArgumentException: No Retrofit annotation found. (parameter #2)
for method GithubServiceApi1.getUser
at retrofit2.Utils.methodError(Utils.java:52)
at retrofit2.Utils.methodError(Utils.java:42)
at retrofit2.Utils.parameterError(Utils.java:61)
at retrofit2.RequestFactory $B u i l d e r . p a r s e P a r a m e t e r (R e q u e s t F a c t o r y . j a v a : 311) a t r e t r o f i t 2 . R e q u e s t F a c t o r y$ Builder.build(RequestFactory.java:182)
at retrofit2.RequestFactory.parseAnnotations(RequestFactory.java:65)
at retrofit2.ServiceMethod.parseAnnotations(ServiceMethod.java:25)
at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:168)
at retrofit2.Retrofit $1 . i n v o k e (R e t r o f i t . j a v a : 147) a t c o m . s u n . p r o x y .$ Proxy0.getUser(Unknown Source)
at com.example.samplejvm.suspend.GithubServiceKt $m a i n$ job $1 . i n v o k e S u s p e n d (G i t h u b S e r v i c e . k t : 44) a t k o t l i n . c o r o u t i n e s . j v m . i n t e r n a l . B a s e C o n t i n u a t i o n I m p l . r e s u m e W i t h (C o n t i n u a t i o n I m p l . k t : 33) a t k o t l i n x . c o r o u t i n e s . D i s p a t c h e d T a s k . r u n (D i s p a t c h e d . k t : 238) a t k o t l i n x . c o r o u t i n e s . s c h e d u l i n g . C o r o u t i n e S c h e d u l e r . r u n S a f e l y (C o r o u t i n e S c h e d u l e r . k t : 594) a t k o t l i n x . c o r o u t i n e s . s c h e d u l i n g . C o r o u t i n e S c h e d u l e r . a c c e s s$ runSafely(CoroutineScheduler.kt:60)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:742)