[英]Maven Java compiler errors for protobuf generated Code: incompatible return types
When using Google Protocol Buffers version 3.0.0 (release version), compilation of the following generated java-class by maven results in a compiler error: 使用Google Protocol Buffers 3.0.0版(发行版)时,maven编译以下生成的java-class会导致编译错误:
Java Class (one of the generated ones), which is a simple message "PBReset" without any fields. Java类(生成的一个),它是一个简单的消息“PBReset”,没有任何字段。
// Generated by the protocol buffer compiler. DO NOT EDIT!
// source: PBMessages.proto
package at.fhhagenberg.nemo.traffsim.remote.messages;
/**
* Protobuf type {@code messages.PBReset}
*/
public final class PBReset extends
com.google.protobuf.GeneratedMessageV3 implements
// @@protoc_insertion_point(message_implements:messages.PBReset)
PBResetOrBuilder {
// Use PBReset.newBuilder() to construct.
private PBReset(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
super(builder);
}
private PBReset() {
}
@java.lang.Override
public final com.google.protobuf.UnknownFieldSet
getUnknownFields() {
return com.google.protobuf.UnknownFieldSet.getDefaultInstance();
}
private PBReset(
com.google.protobuf.CodedInputStream input,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws com.google.protobuf.InvalidProtocolBufferException {
this();
try {
boolean done = false;
while (!done) {
int tag = input.readTag();
switch (tag) {
case 0:
done = true;
break;
default: {
if (!input.skipField(tag)) {
done = true;
}
break;
}
}
}
} catch (com.google.protobuf.InvalidProtocolBufferException e) {
throw e.setUnfinishedMessage(this);
} catch (java.io.IOException e) {
throw new com.google.protobuf.InvalidProtocolBufferException(
e).setUnfinishedMessage(this);
} finally {
makeExtensionsImmutable();
}
}
public static final com.google.protobuf.Descriptors.Descriptor
getDescriptor() {
return at.fhhagenberg.nemo.traffsim.remote.messages.PBMessages.internal_static_messages_PBReset_descriptor;
}
protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
internalGetFieldAccessorTable() {
return at.fhhagenberg.nemo.traffsim.remote.messages.PBMessages.internal_static_messages_PBReset_fieldAccessorTable
.ensureFieldAccessorsInitialized(
at.fhhagenberg.nemo.traffsim.remote.messages.PBReset.class, at.fhhagenberg.nemo.traffsim.remote.messages.PBReset.Builder.class);
}
private byte memoizedIsInitialized = -1;
public final boolean isInitialized() {
byte isInitialized = memoizedIsInitialized;
if (isInitialized == 1) return true;
if (isInitialized == 0) return false;
memoizedIsInitialized = 1;
return true;
}
public void writeTo(com.google.protobuf.CodedOutputStream output)
throws java.io.IOException {
}
public int getSerializedSize() {
int size = memoizedSize;
if (size != -1) return size;
size = 0;
memoizedSize = size;
return size;
}
private static final long serialVersionUID = 0L;
@java.lang.Override
public boolean equals(final java.lang.Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof at.fhhagenberg.nemo.traffsim.remote.messages.PBReset)) {
return super.equals(obj);
}
at.fhhagenberg.nemo.traffsim.remote.messages.PBReset other = (at.fhhagenberg.nemo.traffsim.remote.messages.PBReset) obj;
boolean result = true;
return result;
}
@java.lang.Override
public int hashCode() {
if (memoizedHashCode != 0) {
return memoizedHashCode;
}
int hash = 41;
hash = (19 * hash) + getDescriptorForType().hashCode();
hash = (29 * hash) + unknownFields.hashCode();
memoizedHashCode = hash;
return hash;
}
public static at.fhhagenberg.nemo.traffsim.remote.messages.PBReset parseFrom(
com.google.protobuf.ByteString data)
throws com.google.protobuf.InvalidProtocolBufferException {
return PARSER.parseFrom(data);
}
public static at.fhhagenberg.nemo.traffsim.remote.messages.PBReset parseFrom(
com.google.protobuf.ByteString data,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws com.google.protobuf.InvalidProtocolBufferException {
return PARSER.parseFrom(data, extensionRegistry);
}
public static at.fhhagenberg.nemo.traffsim.remote.messages.PBReset parseFrom(byte[] data)
throws com.google.protobuf.InvalidProtocolBufferException {
return PARSER.parseFrom(data);
}
public static at.fhhagenberg.nemo.traffsim.remote.messages.PBReset parseFrom(
byte[] data,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws com.google.protobuf.InvalidProtocolBufferException {
return PARSER.parseFrom(data, extensionRegistry);
}
public static at.fhhagenberg.nemo.traffsim.remote.messages.PBReset parseFrom(java.io.InputStream input)
throws java.io.IOException {
return com.google.protobuf.GeneratedMessageV3
.parseWithIOException(PARSER, input);
}
public static at.fhhagenberg.nemo.traffsim.remote.messages.PBReset parseFrom(
java.io.InputStream input,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws java.io.IOException {
return com.google.protobuf.GeneratedMessageV3
.parseWithIOException(PARSER, input, extensionRegistry);
}
public static at.fhhagenberg.nemo.traffsim.remote.messages.PBReset parseDelimitedFrom(java.io.InputStream input)
throws java.io.IOException {
return com.google.protobuf.GeneratedMessageV3
.parseDelimitedWithIOException(PARSER, input);
}
public static at.fhhagenberg.nemo.traffsim.remote.messages.PBReset parseDelimitedFrom(
java.io.InputStream input,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws java.io.IOException {
return com.google.protobuf.GeneratedMessageV3
.parseDelimitedWithIOException(PARSER, input, extensionRegistry);
}
public static at.fhhagenberg.nemo.traffsim.remote.messages.PBReset parseFrom(
com.google.protobuf.CodedInputStream input)
throws java.io.IOException {
return com.google.protobuf.GeneratedMessageV3
.parseWithIOException(PARSER, input);
}
public static at.fhhagenberg.nemo.traffsim.remote.messages.PBReset parseFrom(
com.google.protobuf.CodedInputStream input,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws java.io.IOException {
return com.google.protobuf.GeneratedMessageV3
.parseWithIOException(PARSER, input, extensionRegistry);
}
public Builder newBuilderForType() { return newBuilder(); }
public static Builder newBuilder() {
return DEFAULT_INSTANCE.toBuilder();
}
public static Builder newBuilder(at.fhhagenberg.nemo.traffsim.remote.messages.PBReset prototype) {
return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
}
public Builder toBuilder() {
return this == DEFAULT_INSTANCE
? new Builder() : new Builder().mergeFrom(this);
}
@java.lang.Override
protected Builder newBuilderForType(
com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
Builder builder = new Builder(parent);
return builder;
}
/**
* Protobuf type {@code messages.PBReset}
*/
public static final class Builder extends
com.google.protobuf.GeneratedMessageV3.Builder<Builder> implements
// @@protoc_insertion_point(builder_implements:messages.PBReset)
at.fhhagenberg.nemo.traffsim.remote.messages.PBResetOrBuilder {
public static final com.google.protobuf.Descriptors.Descriptor
getDescriptor() {
return at.fhhagenberg.nemo.traffsim.remote.messages.PBMessages.internal_static_messages_PBReset_descriptor;
}
protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
internalGetFieldAccessorTable() {
return at.fhhagenberg.nemo.traffsim.remote.messages.PBMessages.internal_static_messages_PBReset_fieldAccessorTable
.ensureFieldAccessorsInitialized(
at.fhhagenberg.nemo.traffsim.remote.messages.PBReset.class, at.fhhagenberg.nemo.traffsim.remote.messages.PBReset.Builder.class);
}
// Construct using at.fhhagenberg.nemo.traffsim.remote.messages.PBReset.newBuilder()
private Builder() {
maybeForceBuilderInitialization();
}
private Builder(
com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
super(parent);
maybeForceBuilderInitialization();
}
private void maybeForceBuilderInitialization() {
if (com.google.protobuf.GeneratedMessageV3
.alwaysUseFieldBuilders) {
}
}
public Builder clear() {
super.clear();
return this;
}
public com.google.protobuf.Descriptors.Descriptor
getDescriptorForType() {
return at.fhhagenberg.nemo.traffsim.remote.messages.PBMessages.internal_static_messages_PBReset_descriptor;
}
public at.fhhagenberg.nemo.traffsim.remote.messages.PBReset getDefaultInstanceForType() {
return at.fhhagenberg.nemo.traffsim.remote.messages.PBReset.getDefaultInstance();
}
public at.fhhagenberg.nemo.traffsim.remote.messages.PBReset build() {
at.fhhagenberg.nemo.traffsim.remote.messages.PBReset result = buildPartial();
if (!result.isInitialized()) {
throw newUninitializedMessageException(result);
}
return result;
}
public at.fhhagenberg.nemo.traffsim.remote.messages.PBReset buildPartial() {
at.fhhagenberg.nemo.traffsim.remote.messages.PBReset result = new at.fhhagenberg.nemo.traffsim.remote.messages.PBReset(this);
onBuilt();
return result;
}
public Builder clone() {
return (Builder) super.clone();
}
public Builder setField(
com.google.protobuf.Descriptors.FieldDescriptor field,
Object value) {
return (Builder) super.setField(field, value);
}
public Builder clearField(
com.google.protobuf.Descriptors.FieldDescriptor field) {
return (Builder) super.clearField(field);
}
public Builder clearOneof(
com.google.protobuf.Descriptors.OneofDescriptor oneof) {
return (Builder) super.clearOneof(oneof);
}
public Builder setRepeatedField(
com.google.protobuf.Descriptors.FieldDescriptor field,
int index, Object value) {
return (Builder) super.setRepeatedField(field, index, value);
}
public Builder addRepeatedField(
com.google.protobuf.Descriptors.FieldDescriptor field,
Object value) {
return (Builder) super.addRepeatedField(field, value);
}
public Builder mergeFrom(com.google.protobuf.Message other) {
if (other instanceof at.fhhagenberg.nemo.traffsim.remote.messages.PBReset) {
return mergeFrom((at.fhhagenberg.nemo.traffsim.remote.messages.PBReset)other);
} else {
super.mergeFrom(other);
return this;
}
}
public Builder mergeFrom(at.fhhagenberg.nemo.traffsim.remote.messages.PBReset other) {
if (other == at.fhhagenberg.nemo.traffsim.remote.messages.PBReset.getDefaultInstance()) return this;
onChanged();
return this;
}
public final boolean isInitialized() {
return true;
}
public Builder mergeFrom(
com.google.protobuf.CodedInputStream input,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws java.io.IOException {
at.fhhagenberg.nemo.traffsim.remote.messages.PBReset parsedMessage = null;
try {
parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
} catch (com.google.protobuf.InvalidProtocolBufferException e) {
parsedMessage = (at.fhhagenberg.nemo.traffsim.remote.messages.PBReset) e.getUnfinishedMessage();
throw e.unwrapIOException();
} finally {
if (parsedMessage != null) {
mergeFrom(parsedMessage);
}
}
return this;
}
public final Builder setUnknownFields(
final com.google.protobuf.UnknownFieldSet unknownFields) {
return this;
}
public final Builder mergeUnknownFields(
final com.google.protobuf.UnknownFieldSet unknownFields) {
return this;
}
// @@protoc_insertion_point(builder_scope:messages.PBReset)
}
// @@protoc_insertion_point(class_scope:messages.PBReset)
private static final at.fhhagenberg.nemo.traffsim.remote.messages.PBReset DEFAULT_INSTANCE;
static {
DEFAULT_INSTANCE = new at.fhhagenberg.nemo.traffsim.remote.messages.PBReset();
}
public static at.fhhagenberg.nemo.traffsim.remote.messages.PBReset getDefaultInstance() {
return DEFAULT_INSTANCE;
}
private static final com.google.protobuf.Parser<PBReset>
PARSER = new com.google.protobuf.AbstractParser<PBReset>() {
public PBReset parsePartialFrom(
com.google.protobuf.CodedInputStream input,
com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws com.google.protobuf.InvalidProtocolBufferException {
return new PBReset(input, extensionRegistry);
}
};
public static com.google.protobuf.Parser<PBReset> parser() {
return PARSER;
}
@java.lang.Override
public com.google.protobuf.Parser<PBReset> getParserForType() {
return PARSER;
}
public at.fhhagenberg.nemo.traffsim.remote.messages.PBReset getDefaultInstanceForType() {
return DEFAULT_INSTANCE;
}
}
Source of proto file (excerpt): 原始文件的来源(摘录):
message PBReset {
}
This is just one of the generated classes, the maven error is the same for all classes and as follows: 这只是生成的类之一,所有类的maven错误都是相同的,如下所示:
[ERROR] C:\Users\Christian\Documents\FuE\Dissertation\Java\workspace\at.fhhagenberg.nemo.traffsim.remote\src\at\fhhagenberg\nemo\traffsim\remote\messages\PBReset.java:[9]
[ERROR] public final class PBReset extends
[ERROR] ^^^^^^^
[ERROR] The return types are incompatible for the inherited methods MessageOrBuilder.getAllFields(), GeneratedMessageV3.getAllFields()
These classes are included within a working Maven-Tycho-Build Configuration, having protobuf-java-3.0.0.jar on its classpath. 这些类包含在一个有效的Maven-Tycho-Build配置中,在其类路径上有protobuf-java-3.0.0.jar 。 When compiling the code within Eclipse, it has no compiler errors. 在Eclipse中编译代码时,它没有编译器错误。
Additionally, also when calling javac from command line with protobuf-java-3.0.0.jar from here on classpath, the generated sources compile without any errors. 此外,在类路径上从此处使用protobuf-java-3.0.0.jar从命令行调用javac时,生成的源代码编译时没有任何错误。
Of course, also the Java source was generated with protoc version 3.0.0 当然,Java源代码也是使用protoc 3.0.0版生成的
I also had a look in MessageOrBuilder class and GeneratedMessageV3 class and the declared getAllFields() method, which both have the same return type, namely public Map<FieldDescriptor, Object>. 我还看了一下MessageOrBuilder类和GeneratedMessageV3类以及声明的getAllFields()方法,它们都具有相同的返回类型,即public Map <FieldDescriptor,Object>。 However, the only difference is the different notation, as in MessageOrBuilder interface it is declared as Map<Descriptors.FieldDescriptor, Object>. 但是,唯一的区别是不同的表示法,因为在MessageOrBuilder接口中它被声明为Map <Descriptors.FieldDescriptor,Object>。
Can someone tell me why the maven java compiler does not recognize these return types as the same type and shows the error? 有人能告诉我为什么maven java编译器不能将这些返回类型识别为相同类型并显示错误吗?
Interesting detail: this (already fixed) bug in Eclipse Java Compiler seems to result in the very same issue: https://bugs.eclipse.org/bugs/show_bug.cgi?id=496591 有趣的细节:Eclipse Java Compiler中的这个(已修复的)错误似乎导致了同样的问题: https : //bugs.eclipse.org/bugs/show_bug.cgi?id = 496591
I had the same issue with Eclipse Neon. Eclipse Neon遇到了同样的问题。 I updated my eclipse to version 4.6.1 and the issue was solved. 我将我的eclipse更新到版本4.6.1,问题解决了。
@Christian: Your interesting detail helped me. @Christian:你有趣的细节帮助了我。 Thanks for the tip. 谢谢你的提示。
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