質問編集履歴
1
コードとエラー内容の追加
test
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File without changes
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test
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@@ -27,3 +27,167 @@
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27
27
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Eclipse Photon 4.8.0
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28
28
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29
29
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MySQL 8.0.11
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30
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31
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32
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33
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34
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35
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以下、該当コードとエラー内容です。
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36
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37
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**DbUtility.java**
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38
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39
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```Java
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40
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41
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package jp.co.db;
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42
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43
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44
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45
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import java.sql.Connection;
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46
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47
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import java.sql.DriverManager;
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48
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49
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import java.sql.SQLException;
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50
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51
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52
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53
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public class DbUtil {
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54
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55
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public static Connection dbConnect() throws SQLException, ClassNotFoundException {
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56
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57
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58
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59
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Class.forName("com.mysql.jdbc.Driver");
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60
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61
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// Connectionの生成
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62
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63
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Connection con = DriverManager.getConnection(
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64
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65
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"jdbc:mysql://localhost:3306/mysql?serverTimezone=UTC" // データベース
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66
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67
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, "achm" // ユーザ
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68
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69
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, "nia" // パスワード
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70
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71
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);
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72
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73
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System.out.println(con);
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74
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75
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return con;
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76
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77
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78
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79
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}
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80
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81
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82
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83
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public static void dbClose(Connection con) throws SQLException{
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84
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85
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con.close();
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86
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87
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}
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88
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89
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90
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91
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}
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92
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93
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94
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95
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```
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96
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97
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98
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99
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```Error
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100
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101
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java.sql.SQLException: null, message from server: "Host 'localhost' is not allowed to connect to this MySQL server"
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102
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103
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at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965)
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104
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105
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at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:898)
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106
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107
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at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:887)
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108
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109
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at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1038)
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110
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111
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at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2190)
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112
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113
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at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2221)
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114
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115
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at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2016)
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116
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117
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at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:776)
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118
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119
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at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
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120
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121
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at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
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122
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+
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123
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at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
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124
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125
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at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
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126
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127
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at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488)
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128
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129
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at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
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130
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131
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at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:386)
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132
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133
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at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)
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134
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135
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at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:678)
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136
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137
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at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:229)
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138
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139
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at jp.co.db.DbUtil.dbConnect(DbUtil.java:12)
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140
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+
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141
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at jp.co.ClientLogin.clientLogin(ClientLogin.java:18)
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142
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+
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143
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at jp.co.ClientLoginServlet.doPost(ClientLoginServlet.java:32)
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144
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+
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145
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at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
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146
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+
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147
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at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
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148
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149
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at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
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150
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+
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151
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at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
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152
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+
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153
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at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
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154
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+
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155
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at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
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156
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+
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157
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at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
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158
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+
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159
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at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
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160
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+
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161
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at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
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162
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+
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163
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at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
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164
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+
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165
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at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
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166
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+
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167
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at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
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168
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+
|
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169
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at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
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170
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+
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171
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at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
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172
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+
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173
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at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
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174
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+
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175
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at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
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176
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+
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177
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+
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
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178
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+
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179
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+
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
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180
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+
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181
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+
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468)
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182
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+
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183
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at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
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184
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+
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185
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+
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
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|
186
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+
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187
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at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
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188
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+
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189
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at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
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190
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+
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191
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+
at java.base/java.lang.Thread.run(Thread.java:844)
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192
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+
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193
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```
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