Kotlin异常未捕获?

Question

我想知道为什么使用以下代码异常不会被捕获:

private inline fun <reified T : Any> parseResponse(
httpConnection: HttpURLConnection,
noinline callback: ResponseBlock<T>?
) {
with(httpConnection) {
var error: Throwable? = null
val model = try {
if (this.responseCode in 200..299) {
jacksonObjectMapper().readValue(
this.inputStream.bufferedReader().readText(),
T::class.java
)
} else {
null
}
} catch (e: Exception) {
error = e
null
}
if (model == null && error == null) {
error = try {
if (this.responseCode !in 200..299) {
val errorResponse = this.errorStream.bufferedReader().readText()
Throwable(errorResponse)
} else {
null
}
} catch (e: Exception) {
e
}
}
error?.let {
Log.e(this::class.simpleName, it.message, it)
}
callback?.invoke(this.responseCode, model, error)
this.disconnect()
}
}

函数被这样调用:

private inline fun <reified T : Any> get(
pathComponents: Array<String>,
noinline callback: ResponseBlock<T>?,
queryParameters: Map<String, Any>? = null
) {
thread(start = true) {
val urlRequest = createUrlRequest(HttpMethod.GET, pathComponents, queryParameters)
parseResponse(urlRequest, callback)
}
}

我仍然得到这个异常，导致应用程序崩溃:

E/HttpURLConnectionImpl: Failed to connect to /10.0.2.2:8080
java.net.ConnectException: Failed to connect to /10.0.2.2:8080
at com.android.okhttp.internal.io.RealConnection.connectSocket(RealConnection.java:147)
at com.android.okhttp.internal.io.RealConnection.connect(RealConnection.java:116)
at com.android.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:186)
at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:128)
at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:97)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:289)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:232)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:465)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:411)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:542)
at io.openremote.app.network.ApiManager$getAppConfig$$inlined$get$1.invoke(ApiManager.kt:148)
at io.openremote.app.network.ApiManager$getAppConfig$$inlined$get$1.invoke(ApiManager.kt:14)
at kotlin.concurrent.ThreadsKt$thread$thread$1.run(Thread.kt:30)
E/AndroidRuntime: FATAL EXCEPTION: Thread-2
Process: io.openremote.app, PID: 3901
java.net.ConnectException: Failed to connect to /10.0.2.2:8080
at com.android.okhttp.internal.io.RealConnection.connectSocket(RealConnection.java:147)
at com.android.okhttp.internal.io.RealConnection.connect(RealConnection.java:116)
at com.android.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:186)
at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:128)
at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:97)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:289)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:232)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:465)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:411)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:542)
at io.openremote.app.network.ApiManager$getAppConfig$$inlined$get$1.invoke(ApiManager.kt:148)
at io.openremote.app.network.ApiManager$getAppConfig$$inlined$get$1.invoke(ApiManager.kt:14)
at kotlin.concurrent.ThreadsKt$thread$thread$1.run(Thread.kt:30)

我想说try/catch块会捕获异常，但是唉…

是什么导致异常没有被捕获?我想说线程并不重要，因为我使用try/catch块来处理线程中的异常。

更新在Laalto的回答之后，我已经更新了代码，看起来像这样(对于那些感兴趣的人):

private inline fun <reified T : Any> parseResponse(
httpConnection: HttpURLConnection,
noinline callback: ResponseBlock<T>?
) {
with(httpConnection) {
val parsedResult = try {
if (this.responseCode in 200..299) {
Triple(
this.responseCode, jacksonObjectMapper().readValue(
this.inputStream.bufferedReader().readText(),
T::class.java
), null
)
} else {
val errorResponse = this.errorStream.bufferedReader().readText()
Triple(this.responseCode, null, Throwable(errorResponse))
}
} catch (e: Exception) {
Triple(0, null, e)
}
parsedResult.third?.let {
Log.e(this::class.simpleName, it.message, it)
}
callback?.invoke(parsedResult.first, parsedResult.second, parsedResult.third)
this.disconnect()
}
}

Answer 1

堆栈跟踪显示尝试调用getResponseCode()的异常。在没有try-catch块的情况下，有一次访问responseCode:

callback?.invoke(this.responseCode, model, error)

前面的catch块工作得很好，但是代码继续执行这部分，然后抛出异常。

在你更新的问题中，你已经围绕这个问题重组了代码。