Maven & Protobuf compile error: Cannot find symbol in package com.google.protobuf
Solution 1
I had the same problem. building the protobuf sources from google directly (I used 2.5.0) and doing
mvn install:install-file -Dpackaging=jar -DgeneratePom=true -DgroupId=com.google.protobuf -DartifactId=protobuf-java -Dfile=protobuf-java-2.5.0.jar -Dversion=2.5.0
fixed the problem for me.
In my earlier trials I noticed, that the jar-file in /root/.m2/repository/com/google/protobuf/protobuf-java/2.5.0/ was missing.
Maybe try to use version 2.5.0 in the pom.xml and/or copying the jarfile manually.
cheers
Solution 2
I had this problem when there was a mismatch between the protoc version installed and the version listed in the pom. Matching the versions fixed the problem. In my case, I had to switch my protoc version back to 2.4.1 to match the POM.
Solution 3
The protoc --version
has to be the same version to as set in pom.xml
file (protobuf-java-2.5.0.jar
).
Solution 4
My problem was that one unit test extended class from main folder. I solved it with:
<!-- Allow tests to call classes in main folder -->
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.9.1</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>src/test/java</source>
<source>src/main/java</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
Solution 5
For me, it is resolved after using below in build script
<clearOutputDirectory>false</clearOutputDirectory
Complete build script
<build>
<extensions>
<extension>
<groupId>kr.motd.maven</groupId>
<artifactId>os-maven-plugin</artifactId>
<version>1.5.0.Final</version>
</extension>
</extensions>
<plugins>
<plugin>
<groupId>org.xolstice.maven.plugins</groupId>
<artifactId>protobuf-maven-plugin</artifactId>
<version>0.5.1</version>
<configuration>
<protocArtifact>com.google.protobuf:protoc:3.6.1:exe:${os.detected.classifier}</protocArtifact>
<pluginId>grpc-java</pluginId>
<pluginArtifact>io.grpc:protoc-gen-grpc-java:1.19.0:exe:${os.detected.classifier}</pluginArtifact>
<clearOutputDirectory>false</clearOutputDirectory>
<outputDirectory>${basedir}/src/main/java/</outputDirectory>
</configuration>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>compile-custom</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
Katie
Software Engineer specializing in everything web. These are a few of my favorite things: angular node.js javascript go python java c++ bash jquery katies.io
Updated on July 23, 2022Comments
-
Katie almost 2 years
I'm new to Linux and Protobuf.. I need help.
I'm trying to "mvn package" a project that contains many ".proto" files, and a pom.xml file of course...
I'm working on Ubuntu
=======================================
ERROR
When I run "mvn package", I receive this error:
after
... Compiling 11 source files to .../target/classes ...
I get a bunch of these errors:
[ERROR] .../target/generated-sources/...java:[16457,30] cannot find symbol [ERROR] symbol : class Parser [ERROR] location: package com.google.protobuf [ERROR] [ERROR] .../target/generated-sources/...java:[17154,37] cannot find symbol [ERROR] symbol : class Parser [ERROR] location: package com.google.protobuf [ERROR] [ERROR] .../target/generated-sources/...java:[17165,30] cannot find symbol [ERROR] symbol : class Parser [ERROR] location: package com.google.protobuf [ERROR] [ERROR] .../target/generated-sources/...java:[17909,37] cannot find symbol [ERROR] symbol : class Parser [ERROR] location: package com.google.protobuf [ERROR]
=======================================
POM
Here is the pom.xml file, with groupId & artifactId taken out:
<project> <modelVersion>4.0.0</modelVersion> <parent> <groupId>*****</groupId> <artifactId>*****</artifactId> <version>1.0-SNAPSHOT</version> </parent> <artifactId>*****</artifactId> <version>1.0-SNAPSHOT</version> <properties> <proto.cas.path>${project.basedir}/src</proto.cas.path> <target.gen.source.path>${project.basedir}/target/generated-sources</target.gen.source.path> </properties> <dependencies> <dependency> <groupId>com.google.protobuf</groupId> <artifactId>protobuf-java</artifactId> <version>2.4.1</version> <scope>compile</scope> </dependency> </dependencies> <build> <sourceDirectory>${project.basedir}/src</sourceDirectory> <plugins> <plugin> <artifactId>maven-compiler-plugin</artifactId> <version>2.0.2</version> <configuration> <source>1.6</source> <target>1.6</target> <includes><include>**/commonapps/**</include></includes> </configuration> </plugin> <plugin> <artifactId>maven-antrun-plugin</artifactId> <executions> <execution> <id>generate-sources</id> <phase>generate-sources</phase> <configuration> <tasks> <mkdir dir="${target.gen.source.path}" /> <path id="proto.path.files"> <fileset dir="${proto.cas.path}"> <include name="*.proto" /> </fileset> </path> <pathconvert pathsep=" " property="proto.files" refid="proto.path.files" /> <exec executable="protoc"> <arg value="--java_out=${target.gen.source.path}" /> <arg value="--proto_path=${proto.cas.path}" /> <arg line="${proto.files}" /> </exec> </tasks> <sourceRoot>${target.gen.source.path}</sourceRoot> </configuration> <goals> <goal>run</goal> </goals> </execution> </executions> </plugin> </plugins> </build> </project>
=======================================
PROTOBUF INSTALLATION
I've done
./configure make make check make install
in protobuf/,
and
mvn test mvn install mvn package
in protobuf/java.
I took the jar in protobuf/java/target
and added it to my maven repo by running:
mvn install:install-file -Dpackaging=jar -DgeneratePom=true -DgroupId=com.google.protobuf -DartifactId=protobuf-java -Dfile=protobuf-java-2.4.1.jar -Dversion=2.4.1
Note that I've messed around with $LD_LIBRARY_PATH. Currently when I run echo it, I get:
/usr/local/lib/:/usr/:/usr/lib/:/usr/local/
yeah.... as you can tell I don't have a clue about setting $LD_LIBRARY_PATH
I also ran:
apt-get install protobuf-compiler
=======================================
PROTOC INSTALLATION
I forgot what I did to make protoc work, but when I run
protoc --version
I get
libprotoc 2.5.0
=======================================
MY QUESTION IS SIMILAR TO:
Problems using protobufs with java and scala
=======================================
POSSIBLE RELEVANCE?
still not find package, after 'mvn install'
http://www.scriptol.com/programming/protocol-buffers-tutorial.php
Can anyone help?
=======================================
PROGRESS
Apparently it's a plugin failure:
https://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.0.2:compile (default-compile) on project casprotobuf: Compilation failure: Compilation failure: