java - Derby Apache ランダム NullPointerException

Question

組み込みの Apache Derby の使用に問題があります。明らかな理由もなく、NULL ポインター例外が発生します。このコードは、EmbeddedSimpleDataSource クラスを使用して DB にアクセスし、Statement を使用してクエリを実行します。

アプリケーションは、Java Foundation プロファイル/CDC 1.1 (jvm の代わりに cvm を使用) で実行され、組み込みバージョンの Derby が使用されます。

奇妙なのは、問題が完全にランダムであることです (少なくとも私たちにとっては、再現できていません)。以下のログからわかるように、例外は非常に単純な選択クエリで発生します。

例外が 3 回以上発生することもありますが、その後はすべて正常に戻ります。(DB への後続の呼び出しがすべて失敗することはほとんどありません。アクセスを回復する唯一の方法は、アプリケーションを再起動することです (場合によっては、データベースフォルダーを削除して再作成する必要さえあります))。

derby ログファイルの抜粋を次に示します。

   Tue Oct 01 22:51:51 CEST 2013:
Booting Derby version The Apache Software Foundation - Apache Derby - 10.10.1.1 - (1458268): instance c013800d-0141-75ca-8140-000000068414 
on database directory /mnt/nand/lu/smarthubdb with class loader sun.misc.Launcher$AppClassLoader[ucp=sun.misc.URLClassPath[path=file:/mnt/nand/lu/SmartHub.jar],parent=sun.misc.Launcher$ExtClassLoader[ucp=sun.misc.URLClassPath[path=file:/usr/lib/ext/API_3.05.jar,file:/usr/lib/ext/sunjce_provider.jar],parent=null]] 
Loaded from file:/mnt/nand/lu/lib/derby.jar
java.vendor=Sun Microsystems Inc.
user.dir=/mnt/nand/lu
os.name=Linux
os.arch=sh3
os.version=2.6.25.9-svn298-dirty2
derby.system.home=null
Database Class Loader started - derby.database.classpath=''
Wed Oct 02 05:53:23 CEST 2013 Thread[main,5,main] (XID = 33536), (SESSIONID = 3), (DATABASE = smarthubdb), (DRDAID = null), Cleanup action starting
Wed Oct 02 05:53:23 CEST 2013 Thread[main,5,main] (XID = 33536), (SESSIONID = 3), (DATABASE = smarthubdb), (DRDAID = null), Failed Statement is: SELECT device.serial_number, tariff,reference_power_active, overload_power_limit_active, breaker_state,logical_device_type.name FROM device, logical_device_type WHERE device.id_logical_device_type = logical_device_type.id AND serial_number='041068350153'
java.lang.NullPointerException
    at org.apache.derby.exe.ac601a400fx0141x75cax8140x00000006841480.createResultSet(Compiled Method)(Unknown Source)
    at org.apache.derby.impl.sql.execute.CursorActivation.decorateResultSet(Unknown Source)
    at org.apache.derby.impl.sql.execute.BaseActivation.execute(Unknown Source)
    at org.apache.derby.impl.sql.GenericActivationHolder.execute(Unknown Source)
    at org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(Compiled Method)(Unknown Source)
    at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Compiled Method)(Unknown Source)
    at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown Source)
    at org.apache.derby.impl.jdbc.EmbedStatement.execute(Compiled Method)(Unknown Source)
    at org.apache.derby.impl.jdbc.EmbedStatement.executeQuery(Unknown Source)
    at com.s.g.a.c(Unknown Source)
    at com.s.g.a.a(Unknown Source)
    at com.s.g.b.a(Unknown Source)
    at com.s.statemachine.b.e.b(Unknown Source)
    at com.s.statemachine.b.i.c(Compiled Method)(Unknown Source)
    at com.s.statemachine.SmartHub.A(Compiled Method)(Unknown Source)
    at com.s.statemachine.SmartHub.a(Unknown Source)
    at com.s.statemachine.SmartHub.main(Unknown Source)
    at sun.misc.CVM.runMain(Unknown Source)
Cleanup action completed
Wed Oct 02 06:15:26 CEST 2013 Thread[main,5,main] (XID = 34359), (SESSIONID = 7), (DATABASE = smarthubdb), (DRDAID = null), Cleanup action starting
Wed Oct 02 06:15:26 CEST 2013 Thread[main,5,main] (XID = 34359), (SESSIONID = 7), (DATABASE = smarthubdb), (DRDAID = null), Failed Statement is: SELECT device.serial_number, tariff,reference_power_active, overload_power_limit_active, breaker_state,logical_device_type.name FROM device, logical_device_type WHERE device.id_logical_device_type = logical_device_type.id AND serial_number='041067350131'
java.lang.NullPointerException
    at org.apache.derby.exe.ac601a400fx0141x75cax8140x00000006841485.createResultSet(Compiled Method)(Unknown Source)
    at org.apache.derby.impl.sql.execute.CursorActivation.decorateResultSet(Unknown Source)
    at org.apache.derby.impl.sql.execute.BaseActivation.execute(Unknown Source)
    at org.apache.derby.impl.sql.GenericActivationHolder.execute(Unknown Source)
    at org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(Compiled Method)(Unknown Source)
    at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown Source)
    at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown Source)
    at org.apache.derby.impl.jdbc.EmbedStatement.execute(Compiled Method)(Unknown Source)
    at org.apache.derby.impl.jdbc.EmbedStatement.executeQuery(Unknown Source)
    at com.s.g.a.c(Unknown Source)
    at com.s.g.a.a(Unknown Source)
    at com.s.g.b.a(Unknown Source)
    at com.s.statemachine.b.e.b(Unknown Source)
    at com.s.statemachine.b.i.c(Compiled Method)(Unknown Source)
    at com.s.statemachine.SmartHub.A(Compiled Method)(Unknown Source)
    at com.s.statemachine.SmartHub.a(Unknown Source)
    at com.s.statemachine.SmartHub.main(Unknown Source)
    at sun.misc.CVM.runMain(Unknown Source)
Cleanup action completed

テーブルの構造は次のとおりです。

private final static String               MCS_TABLE      = "metering_campaign_strategy";
private final static String[]             MCS_COLS       = { "serial_number",
            "measure_kind", "frequencyUnit", "frequency", "begin_date", "end_date", "last_retrieve_date" };
private final static String[]             MCS_COLS_TYPES = { "varchar(40) NOT NULL",
            "varchar(15) NOT NULL", "varchar(10) NOT NULL", "integer", "timestamp NOT NULL", "timestamp", "timestamp" }

;

ご覧のとおり、問題が発生するテーブルはプログラムで作成されています。

DumpClassFile オプションを追加しました。結果がわかり次第、この投稿を更新します

リクエストに応じて、データベースのスキーマを次に示します。

Wed Oct 02 18:53:14 CEST 2013 Thread[main,5,main] (XID = 165), (SESSIONID = 0), (DATABASE = smarthubdb), (DRDAID = null), Committing
Wed Oct 02 18:53:14 CEST 2013 Thread[main,5,main] (XID = 165), (SESSIONID = 0), (DATABASE = smarthubdb), (DRDAID = null), Rolling back
Wed Oct 02 18:53:14 CEST 2013 Thread[main,5,main] (XID = 166), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Committing
Wed Oct 02 18:53:15 CEST 2013 Thread[main,5,main] (XID = 167), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Begin compiling prepared statement: CREATE TABLE device (serial_number varchar(40), id_logical_device_type integer, tariff varchar(16), reference_power_active integer, overload_power_limit_active integer, breaker_state integer) :End prepared statement
Wed Oct 02 18:53:21 CEST 2013 Thread[main,5,main] (XID = 167), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), End compiling prepared statement: CREATE TABLE device (serial_number varchar(40), id_logical_device_type integer, tariff varchar(16), reference_power_active integer, overload_power_limit_active integer, breaker_state integer) :End prepared statement
Wed Oct 02 18:53:22 CEST 2013 Thread[main,5,main] (XID = 167), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Executing prepared statement: CREATE TABLE device (serial_number varchar(40), id_logical_device_type integer, tariff varchar(16), reference_power_active integer, overload_power_limit_active integer, breaker_state integer) :End prepared statement
Wed Oct 02 18:53:23 CEST 2013 Thread[main,5,main] (XID = 167), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Committing
Wed Oct 02 18:53:24 CEST 2013 Thread[main,5,main] (XID = 171), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Begin compiling prepared statement: CREATE TABLE measure (id_device varchar(40) NOT NULL, date timestamp NOT NULL, value decimal(12,2), type integer, sent boolean) :End prepared statement
Wed Oct 02 18:53:24 CEST 2013 Thread[main,5,main] (XID = 171), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), End compiling prepared statement: CREATE TABLE measure (id_device varchar(40) NOT NULL, date timestamp NOT NULL, value decimal(12,2), type integer, sent boolean) :End prepared statement
Wed Oct 02 18:53:24 CEST 2013 Thread[main,5,main] (XID = 171), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Executing prepared statement: CREATE TABLE measure (id_device varchar(40) NOT NULL, date timestamp NOT NULL, value decimal(12,2), type integer, sent boolean) :End prepared statement
Wed Oct 02 18:53:26 CEST 2013 Thread[main,5,main] (XID = 171), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Committing
Wed Oct 02 18:53:27 CEST 2013 Thread[main,5,main] (XID = 184), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Begin compiling prepared statement: CREATE TABLE message (id_device varchar(40) NOT NULL, date integer, message varchar(100)) :End prepared statement
Wed Oct 02 18:53:27 CEST 2013 Thread[main,5,main] (XID = 184), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), End compiling prepared statement: CREATE TABLE message (id_device varchar(40) NOT NULL, date integer, message varchar(100)) :End prepared statement
Wed Oct 02 18:53:27 CEST 2013 Thread[main,5,main] (XID = 184), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Executing prepared statement: CREATE TABLE message (id_device varchar(40) NOT NULL, date integer, message varchar(100)) :End prepared statement
Wed Oct 02 18:53:27 CEST 2013 Thread[main,5,main] (XID = 184), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Committing
Wed Oct 02 18:53:28 CEST 2013 Thread[main,5,main] (XID = 187), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Begin compiling prepared statement: CREATE TABLE logical_device_type (id integer, name varchar(100)) :End prepared statement
Wed Oct 02 18:53:28 CEST 2013 Thread[main,5,main] (XID = 187), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), End compiling prepared statement: CREATE TABLE logical_device_type (id integer, name varchar(100)) :End prepared statement
Wed Oct 02 18:53:28 CEST 2013 Thread[main,5,main] (XID = 187), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Executing prepared statement: CREATE TABLE logical_device_type (id integer, name varchar(100)) :End prepared statement
Wed Oct 02 18:53:28 CEST 2013 Thread[main,5,main] (XID = 187), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Committing
Wed Oct 02 18:53:29 CEST 2013 Thread[main,5,main] (XID = 193), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Begin compiling prepared statement: CREATE TABLE load_curve (id_device varchar(40) NOT NULL, date timestamp NOT NULL, value integer, error integer, sent boolean) :End prepared statement
Wed Oct 02 18:53:29 CEST 2013 Thread[main,5,main] (XID = 193), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), End compiling prepared statement: CREATE TABLE load_curve (id_device varchar(40) NOT NULL, date timestamp NOT NULL, value integer, error integer, sent boolean) :End prepared statement
Wed Oct 02 18:53:29 CEST 2013 Thread[main,5,main] (XID = 193), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Executing prepared statement: CREATE TABLE load_curve (id_device varchar(40) NOT NULL, date timestamp NOT NULL, value integer, error integer, sent boolean) :End prepared statement
Wed Oct 02 18:53:29 CEST 2013 Thread[main,5,main] (XID = 193), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Committing
Wed Oct 02 18:53:29 CEST 2013 Thread[main,5,main] (XID = 196), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Begin compiling prepared statement: CREATE TABLE load_curve_last_collect (id_device varchar(40) NOT NULL, date timestamp NOT NULL) :End prepared statement
Wed Oct 02 18:53:30 CEST 2013 Thread[main,5,main] (XID = 196), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), End compiling prepared statement: CREATE TABLE load_curve_last_collect (id_device varchar(40) NOT NULL, date timestamp NOT NULL) :End prepared statement
Wed Oct 02 18:53:30 CEST 2013 Thread[main,5,main] (XID = 196), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Executing prepared statement: CREATE TABLE load_curve_last_collect (id_device varchar(40) NOT NULL, date timestamp NOT NULL) :End prepared statement
Wed Oct 02 18:53:30 CEST 2013 Thread[main,5,main] (XID = 196), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Committing
Wed Oct 02 18:53:30 CEST 2013 Thread[main,5,main] (XID = 199), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Begin compiling prepared statement: CREATE TABLE tariff (type integer, name varchar(100)) :End prepared statement
Wed Oct 02 18:53:30 CEST 2013 Thread[main,5,main] (XID = 199), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), End compiling prepared statement: CREATE TABLE tariff (type integer, name varchar(100)) :End prepared statement
Wed Oct 02 18:53:30 CEST 2013 Thread[main,5,main] (XID = 199), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Executing prepared statement: CREATE TABLE tariff (type integer, name varchar(100)) :End prepared statement
Wed Oct 02 18:53:31 CEST 2013 Thread[main,5,main] (XID = 199), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Committing
Wed Oct 02 18:53:31 CEST 2013 Thread[main,5,main] (XID = 202), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Begin compiling prepared statement: CREATE TABLE state_configuration (state_name varchar(50), last_execution timestamp) :End prepared statement
Wed Oct 02 18:53:31 CEST 2013 Thread[main,5,main] (XID = 202), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), End compiling prepared statement: CREATE TABLE state_configuration (state_name varchar(50), last_execution timestamp) :End prepared statement
Wed Oct 02 18:53:31 CEST 2013 Thread[main,5,main] (XID = 202), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Executing prepared statement: CREATE TABLE state_configuration (state_name varchar(50), last_execution timestamp) :End prepared statement
Wed Oct 02 18:53:31 CEST 2013 Thread[main,5,main] (XID = 202), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Committing
Wed Oct 02 18:53:32 CEST 2013 Thread[main,5,main] (XID = 205), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Begin compiling prepared statement: CREATE TABLE metering_campaign_strategy (serial_number varchar(40) NOT NULL, measure_kind varchar(15) NOT NULL, frequencyUnit varchar(10) NOT NULL, frequency integer, begin_date timestamp NOT NULL, end_date timestamp, last_retrieve_date timestamp) :End prepared statement
Wed Oct 02 18:53:32 CEST 2013 Thread[main,5,main] (XID = 205), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), End compiling prepared statement: CREATE TABLE metering_campaign_strategy (serial_number varchar(40) NOT NULL, measure_kind varchar(15) NOT NULL, frequencyUnit varchar(10) NOT NULL, frequency integer, begin_date timestamp NOT NULL, end_date timestamp, last_retrieve_date timestamp) :End prepared statement
Wed Oct 02 18:53:32 CEST 2013 Thread[main,5,main] (XID = 205), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Executing prepared statement: CREATE TABLE metering_campaign_strategy (serial_number varchar(40) NOT NULL, measure_kind varchar(15) NOT NULL, frequencyUnit varchar(10) NOT NULL, frequency integer, begin_date timestamp NOT NULL, end_date timestamp, last_retrieve_date timestamp) :End prepared statement
Wed Oct 02 18:53:33 CEST 2013 Thread[main,5,main] (XID = 205), (SESSIONID = 1), (DATABASE = smarthubdb), (DRDAID = null), Committing

ありがとう

score 0 · Accepted Answer

問題はNULL、何らかの理由で特定できないデータがあることですNOT NULL。

このデータがデータベースからのものである場合、すべての列を作成すると、データが挿入されているNOT NULLABLE場所が明らかになります。NULL

データがモデルコードからのものである場合、Googleの JSR 305 ライブラリを使用して、すべてのメソッドシグネチャですべてに注釈を付けることができ、参照が渡されている@Nonnull場所を見つけることができます。NULL

どちらの方法でも、長期的にはコードの保守性と品質が向上します。

java - Derby Apache ランダム NullPointerException

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