首先附上github地址：blockchain-application-using-fabric-java-sdk
我安装readme中的步骤来，把区块链网络跑起来之后，创建channel成功了，安装链码也成功了，只是最后在实例化（instantiate）链码的时候一直失败，提示：
could not build chaincode: docker build failed: docker image build failed: docker build failed: Error returned from build: 1 "/chaincode/input/src/github.com/chaincode/farcar.go:37:2: cannot find package “github.com/hyperledger/core/chaincode/shim” in any of:
/usr/local/go/src/github.com/hyperledger/core/chaincode/shim (from $GOROOT)
/chaincode/input/src/github.com/hyperledger/fabric-chaincode-go/shim (from $GOPATH)
/go/src/github.com/hyperledger/fabric-chaincode-go/shim
/chaincode/input/src/github.com/chaincode/pcurd.go:38:6: cannot find package “github.com/hyperledger/fabric/protos/peer” in any of:
/usr/local/go/src/github.com/hyperledger/fabric/protos/peer (from $GOROOT)
/chaincode/input/src/github.com/hyperledger/fabric/protos/peer (from $GOPATH)
/go/src/github.com/hyperledger/fabric/protos/peer"
这里通过2步解决这个问题。
第一步cd到network_resources/chaincode/src/github.com/fabcar目录下，更改fabcar.go文件import的package，修改后的内容如下：
package main
import (
"bytes"
"encoding/json"
"fmt"
"strconv"
"github.com/hyperledger/fabric-chaincode-go/shim"
sc "github.com/hyperledger/fabric-protos-go/peer"
)
第二步
安装go1.13.15，然后执行：
go env -w GO111MODULE=on
把项目clone下来之后,cd到network_resources/chaincode/src/github.com/fabcar目录下，然后执行
go mod init go mod vendor
然后删掉docker容器，重新跑一遍就好了
